Identity column

Friday, March 30, 2012

If numeric query

I have a table with a memo field that sometimes contains an account
number at the same location. I need to find a record related to that
account in another table. I can write and run a query for a record
which works fine if the account number exists, but (obviously) get an
error if it does not. I wrote the following query which I don't
understand why it will not work.
IF EXISTS (SELECT fldMemo FROM tblRegister WHERE ISNUMERIC(SUBSTRING
(tblRegister.fldMemo,6,9)) = 1)
BEGIN
SELECT fldChkNo, fldDate, fldName, fldMemo, fldAmt, fldTransmitted,
fldStatus, fldLogDate, fldNote
FROM tblRegister INNER JOIN tblNotes ON SUBSTRING
(tblRegister.fldMemo,6,9) = tblNotes.fldMemberNo
END
ELSE
BEGIN
SELECT fldChkNo, fldDate, fldName, fldMemo, fldAmt, fldTransmitted,
fldStatus, fldLogDate
FROM tblRegister
END
Any help on this would be greatly appreciated.
Thanks
CharlesA couple of comments.
First, isnumeric isn't foolproof. You may wish to review this source:
isnumeric -What is wrong?
http://www.aspfaq.com/show.asp?id=2390
Second, it appears that you are attempting to compare a string to a number,
e.g.,
SUBSTRING(tblRegister.fldMemo,6,9) = tblNotes.fldMemberNo
(I'm assuming that tblNotes.fldMemberNo is a numeric datatype.)
You need to cast the first part as a numeric value in order make the compari
son. And this will not use indexing, so expect performance to be poor.
If you were to add another column to the Register table, set its value to be
the substring of the Memo field (or better yet, have the application provid
e the number), and then index that column, performance would be rather sprig
htly.
--
Arnie Rowland, Ph.D.
Westwood Consulting, Inc
Most good judgment comes from experience.
Most experience comes from bad judgment.
- Anonymous
You can't help someone get up a hill without getting a little closer to the
top yourself.
- H. Norman Schwarzkopf
<cbanks@.bjtsupport.com> wrote in message news:1162249400.557355.12560@.k70g2000cwa.googlegrou
ps.com...
>I have a table with a memo field that sometimes contains an account
> number at the same location. I need to find a record related to that
> account in another table. I can write and run a query for a record
> which works fine if the account number exists, but (obviously) get an
> error if it does not. I wrote the following query which I don't
> understand why it will not work.
>
> IF EXISTS (SELECT fldMemo FROM tblRegister WHERE ISNUMERIC(SUBSTRING
> (tblRegister.fldMemo,6,9)) = 1)
>
> BEGIN
> SELECT fldChkNo, fldDate, fldName, fldMemo, fldAmt, fldTransmitted,
> fldStatus, fldLogDate, fldNote
> FROM tblRegister INNER JOIN tblNotes ON SUBSTRING
> (tblRegister.fldMemo,6,9) = tblNotes.fldMemberNo
> END
>
> ELSE
>
> BEGIN
> SELECT fldChkNo, fldDate, fldName, fldMemo, fldAmt, fldTransmitted,
> fldStatus, fldLogDate
> FROM tblRegister
> END
>
> Any help on this would be greatly appreciated.
> Thanks
> Charles
>|||Arnie,
Thanks for the reply. My main issue is when I try to run this as an IF
statement I get an error "Incorrect syntax near the keyword 'BEGIN'."
I actually tried it without the 'Exists' after IF. If I run
SELECT fldChkNo, fldDate, fldName, fldMemo, fldAmt, fldTransmitted,
fldStatus, fldLogDate, fldNote
FROM tblRegister INNER JOIN tblNotes ON SUBSTRING
(tblRegister.fldMemo,6,9) = tblNotes.fldMemberNo with a where clause to
locate a record with a valid member number, it works fine. My issue is
running this when I don't have a valid member ID, which is what I am
trying to accomplish with the if statement.
It would have been better to include the member number in my register
table, but this was not in the original scope and I really don't want
to modify my table structure.
Charles
Arnie Rowland wrote:
> A couple of comments.
> First, isnumeric isn't foolproof. You may wish to review this source:
> isnumeric -What is wrong?
> http://www.aspfaq.com/show.asp?id=2390
>
> Second, it appears that you are attempting to compare a string to a number
, e.g.,
> SUBSTRING(tblRegister.fldMemo,6,9) = tblNotes.fldMemberNo
> (I'm assuming that tblNotes.fldMemberNo is a numeric datatype.)
>
> You need to cast the first part as a numeric value in order make the compa
rison. And this will not use indexing, so expect performance to be poor.
> If you were to add another column to the Register table, set its value to
be the substring of the Memo field (or better yet, have the application prov
ide the number), and then index that column, performance would be rather spr
ightly.
> --
> Arnie Rowland, Ph.D.
> Westwood Consulting, Inc
> Most good judgment comes from experience.
> Most experience comes from bad judgment.
> - Anonymous
> You can't help someone get up a hill without getting a little closer to th
e top yourself.
> - H. Norman Schwarzkopf
>
> <cbanks@.bjtsupport.com> wrote in message news:1162249400.557355.12560@.k70g
2000cwa.googlegroups.com...
> --=_NextPart_000_048F_01C6FC3D.3D5AC000
> Content-Type: text/html; charset=iso-8859-1
> Content-Transfer-Encoding: quoted-printable
> X-Google-AttachSize: 5062
> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
> <HTML><HEAD>
> <META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
> <META content="MSHTML 6.00.5296.0" name=GENERATOR>
> <STYLE></STYLE>
> </HEAD>
> <BODY>
> <DIV><FONT face=Arial size=2>A couple of comments.</FONT></DIV>
> <DIV><FONT face=Arial size=2></FONT> </DIV>
> <DIV><FONT face=Arial size=2>First, isnumeric isn't foolproof. You may wis
h to
> review this source:</FONT></DIV>
> <DIV><FONT face=Arial size=2></FONT> </DIV>
> <DIV>
> <P class=MsoNormal
> style="MARGIN: 0in 0in 6pt; mso-layout-grid-align: none"><SPAN
> style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial; mso-no-proof: yes
">isnumeric
> -What is wrong?<BR></SPAN><SPAN
> style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial; mso-no-proof: ye
s"><A
> href="http://links.10026.com/?link=http://www.aspfaq.com/show.asp?id=2390">http://www.aspfaq.com/show.asp?id=
2390</A>
> </SPAN></P>
> <P class=MsoNormal
> style="MARGIN: 0in 0in 6pt; mso-layout-grid-align: none"><SPAN
> style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial; mso-no-proof: ye
s"><FONT
> face=Arial size=2></FONT></SPAN> </P>
> <P class=MsoNormal
> style="MARGIN: 0in 0in 6pt; mso-layout-grid-align: none"><SPAN
> style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial; mso-no-proof: ye
s">Second,
> it appears that you are attempting to compare a string to a number, e.g.,
> </SPAN></P>
> <P class=MsoNormal
> style="MARGIN: 0in 0in 6pt; mso-layout-grid-align: none"><SPAN
> style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial; mso-no-proof: ye
s"><FONT
> face="Courier New">SUBSTRING(tblRegister.fldMemo,6,9) =
> tblNotes.fldMemberNo</FONT></SPAN></P>
> <P class=MsoNormal
> style="MARGIN: 0in 0in 6pt; mso-layout-grid-align: none"><SPAN
> style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial; mso-no-proof: ye
s">(I'm assuming
> that tblNotes.fldMemberNo is a numeric datatype.)<BR></P></SPAN>
> <P class=MsoNormal
> style="MARGIN: 0in 0in 6pt; mso-layout-grid-align: none"><SPAN
> style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial; mso-no-proof: ye
s">You
> need to cast the first part as a numeric value in order make the compariso
n.
> </SPAN><SPAN
> style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial; mso-no-proof: ye
s">And
> this will not use indexing, so expect performance to be poor.</P></SPAN></
DIV>
> <DIV><FONT face=Arial size=2>If you were to add another column to the Regi
ster
> table, set its value to be the substring of the Memo field (or better yet,
have
> the application provide the number), and then index that column, performan
ce
> would be rather sprightly.</FONT><BR><FONT face=Arial size=2>-- <BR>Arnie
> Rowland, Ph.D.<BR>Westwood Consulting, Inc</FONT></DIV>
> <DIV><FONT face=Arial size=2></FONT> </DIV>
> <DIV><FONT face=Arial size=2>Most good judgment comes from experience. <BR
>Most
> experience comes from bad judgment. <BR>- Anonymous</FONT></DIV>
> <DIV><FONT face=Arial size=2></FONT> </DIV>
> <DIV><FONT face=Arial size=2>You can't help someone get up a hill without
> getting a little closer to the top yourself.<BR>- H. Norman
> Schwarzkopf</FONT></DIV>
> <DIV><FONT face=Arial size=2></FONT> </DIV>
> <DIV><FONT face=Arial size=2></FONT> </DIV>
> <DIV><FONT face=Arial size=2><</FONT><A
> href="http://links.10026.com/?link=mailto:cbanks@.bjtsupport.com"><FONT face=Arial
> size=2>cbanks@.bjtsupport.com</FONT></A><FONT face=Arial size=2>> wrote
in
> message </FONT><A
> href="http://links.10026.com/?link=news:1162249400.557355.12560@.k70g2000cwa.googlegroups.com"><FONT
> face=Arial
> size=2>news:1162249400.557355.12560@.k70g2000cwa.googlegroups.com</FONT></A
><FONT
> face=Arial size=2>...</FONT></DIV><FONT face=Arial size=2>>I have a tab
le
> with a memo field that sometimes contains an account<BR>> number at the
same
> location. I need to find a record related to that<BR>> accoun
t in
> another table. I can write and run a query for a record<BR>>
which
> works fine if the account number exists, but (obviously) get an<BR>> er
ror if
> it does not. I wrote the following query which I don't<BR>> u
nderstand
> why it will not work.<BR>> <BR>> IF EXISTS (SELECT fldMemo FROM
> tblRegister WHERE ISNUMERIC(SUBSTRING<BR>> (tblRegister.fldMemo,6,9)) =
> 1)<BR>> <BR>> BEGIN<BR>> SELECT fldChkNo, fldDate, fldName, fldMe
mo,
> fldAmt, fldTransmitted,<BR>> fldStatus, fldLogDate, fldNote<BR>> FRO
M
> tblRegister INNER JOIN tblNotes ON SUBSTRING<BR>> (tblRegister.fldMemo,
6,9) =
> tblNotes.fldMemberNo<BR>> END<BR>> <BR>> ELSE<BR>> <BR>>
> BEGIN<BR>> SELECT fldChkNo, fldDate, fldName, fldMemo, fldAmt,
> fldTransmitted,<BR>> fldStatus, fldLogDate<BR>> FROM tblRegister<BR>
> END<BR>> <BR>> Any help on this would be greatly appreciated.<BR>>
;
> Thanks<BR>> Charles<BR>></FONT></BODY></HTML>
> --=_NextPart_000_048F_01C6FC3D.3D5AC000--|||Charles,
exists is really for subqueries. However you could use:
IF (SELECT count(*) FROM tblRegister WHERE ISNUMERIC(SUBSTRING
(tblRegister.fldMemo,6,9)) = 1) > 0
....
or
SELECT fldMemo FROM tblRegister WHERE ISNUMERIC(SUBSTRING
(tblRegister.fldMemo,6,9)) = 1
if @.@.rowcount > 0
....
Cheers,
Paul Ibison SQL Server MVP, www.replicationanswers.com .|||> exists is really for subqueries. However you could use:
> IF (SELECT count(*) FROM tblRegister WHERE ISNUMERIC(SUBSTRING
> (tblRegister.fldMemo,6,9)) = 1) > 0
I'm not sure why this is better than
IF EXISTS (SELECT 1 FROM tblRegister ...)
BEGIN
END
? The exists is potentially faster, and certainly not any slower, than a
select count.
The syntax problem he had was likely just a missing parenthesis...
A|||Thanks Aaron - my goof

.
For some obscure reason I had assumed that it was returning a single row
(long night and needed more coffee!), but as I look more closely at what I
wrote I see issues with both solutions - Charles please disregard my earlier
post.
Regards,
Paul Ibison|||Actually, not a missing parens, but including an equality [ = 1 ) > 0 ]
which made the statement invalid. The statement 'should' work as:
IF EXISTS
( SELECT fldMemo
FROM tblRegister
WHERE isnumeric( substring( tblRegister.fldMemo, 6, 9 ))
)
BEGIN
--
Arnie Rowland, Ph.D.
Westwood Consulting, Inc
Most good judgment comes from experience.
Most experience comes from bad judgment.
- Anonymous
You can't help someone get up a hill without getting a little closer to the
top yourself.
- H. Norman Schwarzkopf
"Aaron Bertrand [SQL Server MVP]" <ten.xoc@.dnartreb.noraa> wrote in message news:uFkIfWP
$GHA.4708@.TK2MSFTNGP05.phx.gbl...
>
> I'm not sure why this is better than
>
> IF EXISTS (SELECT 1 FROM tblRegister ...)
> BEGIN
> END
>
> ? The exists is potentially faster, and certainly not any slower, than a
> select count.
>
> The syntax problem he had was likely just a missing parenthesis...
>
> A
>
>|||> Actually, not a missing parens, but including an equality [ = 1 ) > 0 ]">
> which made the statement invalid.
Where? I didn't see his code, I just saw fragments of it.
A

If numeric query

A couple of comments.
First, isnumeric isn't foolproof. You =may wish to review this source:
isnumeric -What is wrong?http://www.aspfaq.com/show.asp?id=3D2390">http://www.aspfaq.com/s=how.asp?id=3D2390
Second, it appears that you are attempting to compare a string to a number, =e.g., SUBSTRING(tblRegister.fldMemo,6,9) =3D tblNotes.fldMemberNo
(I'm assuming that tblNotes.fldMemberNo is a numeric datatype.)
You need to cast the first part as a numeric value in order make the =comparison. And this will not use indexing, so expect performance to be =poor.
If you were to add another column to =the Register table, set its value to be the substring of the Memo field (or better =yet, have the application provide the number), and then index that column, =performance would be rather sprightly.-- =Arnie Rowland, Ph.D.Westwood Consulting, Inc
Most good judgment comes from =experience. Most experience comes from bad judgment. - Anonymous
You can't help someone get up a hill =without getting a little closer to the top yourself.- H. Norman Schwarzkopf
wrote in message news:1162249400.557355.12560@.k70g2000cwa.googlegroups.com=...>I =have a table with a memo field that sometimes contains an account> number at =the same location. I need to find a record related to that> account =in another table. I can write and run a query for a record> =which works fine if the account number exists, but (obviously) get an> =error if it does not. I wrote the following query which I don't> =understand why it will not work.> > IF EXISTS (SELECT fldMemo FROM tblRegister WHERE ISNUMERIC(SUBSTRING> (tblRegister.fldMemo,6,9)) ==3D 1)> > BEGIN> SELECT fldChkNo, fldDate, fldName, =fldMemo, fldAmt, fldTransmitted,> fldStatus, fldLogDate, fldNote> =FROM tblRegister INNER JOIN tblNotes ON SUBSTRING> =(tblRegister.fldMemo,6,9) =3D tblNotes.fldMemberNo> END> > ELSE> > BEGIN> SELECT fldChkNo, fldDate, fldName, fldMemo, fldAmt, fldTransmitted,> fldStatus, fldLogDate> FROM =tblRegister> END> > Any help on this would be greatly =appreciated.> Thanks> Charles>

--=_NextPart_000_048F_01C6FC3D.3D5AC000--|||Arnie,
Thanks for the reply. My main issue is when I try to run this as an IF
statement I get an error "Incorrect syntax near the keyword 'BEGIN'."
I actually tried it without the 'Exists' after IF. If I run
SELECT fldChkNo, fldDate, fldName, fldMemo, fldAmt, fldTransmitted,
fldStatus, fldLogDate, fldNote
FROM tblRegister INNER JOIN tblNotes ON SUBSTRING
(tblRegister.fldMemo,6,9) = tblNotes.fldMemberNo with a where clause to
locate a record with a valid member number, it works fine. My issue is
running this when I don't have a valid member ID, which is what I am
trying to accomplish with the if statement.
It would have been better to include the member number in my register
table, but this was not in the original scope and I really don't want
to modify my table structure.
Charles
Arnie Rowland wrote:
> A couple of comments.
> First, isnumeric isn't foolproof. You may wish to review this source:
> isnumeric -What is wrong?
> http://www.aspfaq.com/show.asp?id=2390
>
> Second, it appears that you are attempting to compare a string to a number, e.g.,
> SUBSTRING(tblRegister.fldMemo,6,9) = tblNotes.fldMemberNo
> (I'm assuming that tblNotes.fldMemberNo is a numeric datatype.)
>
> You need to cast the first part as a numeric value in order make the comparison. And this will not use indexing, so expect performance to be poor.
> If you were to add another column to the Register table, set its value to be the substring of the Memo field (or better yet, have the application provide the number), and then index that column, performance would be rather sprightly.
> --
> Arnie Rowland, Ph.D.
> Westwood Consulting, Inc
> Most good judgment comes from experience.
> Most experience comes from bad judgment.
> - Anonymous
> You can't help someone get up a hill without getting a little closer to the top yourself.
> - H. Norman Schwarzkopf
>
> <cbanks@.bjtsupport.com> wrote in message news:1162249400.557355.12560@.k70g2000cwa.googlegroups.com...
> >I have a table with a memo field that sometimes contains an account
> > number at the same location. I need to find a record related to that
> > account in another table. I can write and run a query for a record
> > which works fine if the account number exists, but (obviously) get an
> > error if it does not. I wrote the following query which I don't
> > understand why it will not work.
> >
> > IF EXISTS (SELECT fldMemo FROM tblRegister WHERE ISNUMERIC(SUBSTRING
> > (tblRegister.fldMemo,6,9)) = 1)
> >
> > BEGIN
> > SELECT fldChkNo, fldDate, fldName, fldMemo, fldAmt, fldTransmitted,
> > fldStatus, fldLogDate, fldNote
> > FROM tblRegister INNER JOIN tblNotes ON SUBSTRING
> > (tblRegister.fldMemo,6,9) = tblNotes.fldMemberNo
> > END
> >
> > ELSE
> >
> > BEGIN
> > SELECT fldChkNo, fldDate, fldName, fldMemo, fldAmt, fldTransmitted,
> > fldStatus, fldLogDate
> > FROM tblRegister
> > END
> >
> > Any help on this would be greatly appreciated.
> > Thanks
> > Charles
> >
> --=_NextPart_000_048F_01C6FC3D.3D5AC000
> Content-Type: text/html; charset=iso-8859-1
> Content-Transfer-Encoding: quoted-printable
> X-Google-AttachSize: 5062
> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
> &

>
>
>
>
>
> A couple of comments.
>
> First, isnumeric isn't foolproof. You may wish to
> review this source:
>
>
> style="MARGIN: 0in 0in 6pt; mso-layout-grid-align: none"> style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial; mso-no-proof: yes">isnumeric
> -What is wrong? style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial; mso-no-proof: yes"> href="http://links.10026.com/?link=http://www.aspfaq.com/show.asp?id=2390">http://www.aspfaq.com/show.asp?id=2390">http://www.aspfaq.com/show.asp?id=2390
>
> style="MARGIN: 0in 0in 6pt; mso-layout-grid-align: none"> style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial; mso-no-proof: yes"> face=Arial size=2>
> style="MARGIN: 0in 0in 6pt; mso-layout-grid-align: none"> style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial; mso-no-proof: yes">Second,
> it appears that you are attempting to compare a string to a number, e.g.,
>
> style="MARGIN: 0in 0in 6pt; mso-layout-grid-align: none"> style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial; mso-no-proof: yes"> face="Courier New">SUBSTRING(tblRegister.fldMemo,6,9) => tblNotes.fldMemberNo
> style="MARGIN: 0in 0in 6pt; mso-layout-grid-align: none"> style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial; mso-no-proof: yes">(I'm assuming
> that tblNotes.fldMemberNo is a numeric datatype.)
> style="MARGIN: 0in 0in 6pt; mso-layout-grid-align: none"> style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial; mso-no-proof: yes">You
> need to cast the first part as a numeric value in order make the comparison.
> style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial; mso-no-proof: yes">And
> this will not use indexing, so expect performance to be poor.
> If you were to add another column to the Register
> table, set its value to be the substring of the Memo field (or better yet, have
> the application provide the number), and then index that column, performance
> would be rather sprightly.-- Arnie
> Rowland, Ph.D.Westwood Consulting, Inc
>
> Most good judgment comes from experience. Most
> experience comes from bad judgment. - Anonymous
>
> You can't help someone get up a hill without
> getting a little closer to the top yourself.- H. Norman
> Schwarzkopf
>
>
>< href="http://links.10026.com/?link=mailto:cbanks@.bjtsupport.com"> size=2>cbanks@.bjtsupport.com> wrote in
> message href="http://links.10026.com/?link=news:1162249400.557355.12560@.k70g2000cwa.googlegroups.com"> face=Arial
> size=2>news:1162249400.557355.12560@.k70g2000cwa.googlegroups.com face=Arial size=2>...>I have a table
> with a memo field that sometimes contains an account> number at the same
> location. I need to find a record related to that> account in
> another table. I can write and run a query for a record> which
> works fine if the account number exists, but (obviously) get an> error if
> it does not. I wrote the following query which I don't> understand
> why it will not work.> > IF EXISTS (SELECT fldMemo FROM
> tblRegister WHERE ISNUMERIC(SUBSTRING> (tblRegister.fldMemo,6,9)) => 1)> > BEGIN> SELECT fldChkNo, fldDate, fldName, fldMemo,
> fldAmt, fldTransmitted,> fldStatus, fldLogDate, fldNote> FROM
> tblRegister INNER JOIN tblNotes ON SUBSTRING> (tblRegister.fldMemo,6,9) => tblNotes.fldMemberNo> END> > ELSE> >
> BEGIN> SELECT fldChkNo, fldDate, fldName, fldMemo, fldAmt,
> fldTransmitted,> fldStatus, fldLogDate> FROM tblRegister>
> END> > Any help on this would be greatly appreciated.>
> Thanks> Charles>

> --=_NextPart_000_048F_01C6FC3D.3D5AC000--|||Charles,
exists is really for subqueries. However you could use:
IF (SELECT count(*) FROM tblRegister WHERE ISNUMERIC(SUBSTRING
(tblRegister.fldMemo,6,9)) = 1) > 0
....
or
SELECT fldMemo FROM tblRegister WHERE ISNUMERIC(SUBSTRING
(tblRegister.fldMemo,6,9)) = 1
if @.@.rowcount > 0
....
Cheers,
Paul Ibison SQL Server MVP, www.replicationanswers.com .|||> exists is really for subqueries. However you could use:
> IF (SELECT count(*) FROM tblRegister WHERE ISNUMERIC(SUBSTRING
> (tblRegister.fldMemo,6,9)) = 1) > 0
I'm not sure why this is better than
IF EXISTS (SELECT 1 FROM tblRegister ...)
BEGIN
END
? The exists is potentially faster, and certainly not any slower, than a
select count.
The syntax problem he had was likely just a missing parenthesis...
A|||Thanks Aaron - my goof :(.
For some obscure reason I had assumed that it was returning a single row
(long night and needed more coffee!), but as I look more closely at what I
wrote I see issues with both solutions - Charles please disregard my earlier
post.
Regards,
Paul Ibison|||This is a multi-part message in MIME format.
--=_NextPart_000_057B_01C6FCC2.47296CF0
Content-Type: text/plain;
charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
Actually, not a missing parens, but including an equality [ =3D 1 ) > 0 =] which made the statement invalid. The statement 'should' work as:
IF EXISTS ( SELECT fldMemo FROM tblRegister WHERE isnumeric( substring( tblRegister.fldMemo, 6, 9 ))
)
BEGIN
-- Arnie Rowland, Ph.D.
Westwood Consulting, Inc
Most good judgment comes from experience. Most experience comes from bad judgment. - Anonymous
You can't help someone get up a hill without getting a little closer to =the top yourself.
- H. Norman Schwarzkopf
"Aaron Bertrand [SQL Server MVP]" <ten.xoc@.dnartreb.noraa> wrote in =message news:uFkIfWP$GHA.4708@.TK2MSFTNGP05.phx.gbl...
>> exists is really for subqueries. However you could use:
>> IF (SELECT count(*) FROM tblRegister WHERE ISNUMERIC(SUBSTRING >> (tblRegister.fldMemo,6,9)) =3D 1) > 0
> > I'm not sure why this is better than
> > IF EXISTS (SELECT 1 FROM tblRegister ...)
> BEGIN
> END
> > ? The exists is potentially faster, and certainly not any slower, =than a > select count.
> > The syntax problem he had was likely just a missing parenthesis...
> > A > >
--=_NextPart_000_057B_01C6FCC2.47296CF0
Content-Type: text/html;
charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
&

Actually, not a missing parens, but =including an equality [ =3D 1 ) > 0 ] which made the statement invalid. The =statement 'should' work as:
IF EXISTS
( SELECT =fldMemo =FROM tblRegister
=WHERE isnumeric( substring( tblRegister.fldMemo, 6, 9 ))
=)
=BEGIN-- Arnie =Rowland, Ph.D.Westwood Consulting, Inc
Most good judgment comes from =experience. Most experience comes from bad judgment. - Anonymous
You can't help someone get up a hill =without getting a little closer to the top yourself.- H. Norman Schwarzkopf
"Aaron Bertrand [SQL Server MVP]" = wrote in message news:uFkIfWP$GHA.4708@.TK2MSFTNGP05.phx.gbl...> exists is really for subqueries. However you could use:> IF (SELECT =count(*) FROM tblRegister WHERE ISNUMERIC(SUBSTRING > (tblRegister.fldMemo,6,9)) =3D 1) > 0> > I'm not sure =why this is better than> > IF EXISTS (SELECT 1 FROM tblRegister =...)> BEGIN> END> > ? The exists is potentially =faster, and certainly not any slower, than a > select count.> > =The syntax problem he had was likely just a missing parenthesis...> => A > >

--=_NextPart_000_057B_01C6FCC2.47296CF0--|||> Actually, not a missing parens, but including an equality [ = 1 ) > 0 ]
> which made the statement invalid.
Where? I didn't see his code, I just saw fragments of it.
A

If Nothing Selected Into Variable What Is The Value Of Variable?

DECLARE @.PayTypeValue numeric (18, 5)
SET @.PayTypeValue = (SELECT [LoadPayValue] FROM [CSITSS].[dbo].[LoadPayType] WHERE [CompanyDiv] = @.CompDiv AND [Deleted] = 0 AND [LoadPayType] = @.LoadPay)
IF THIS QUERY RETURNS NOTHING WHAT DOES IT SET @.PayTypeValue to?
NULL OR 0DECLARE @.PayTypeValue numeric (18, 5)

SET @.PayTypeValue = (SELECT [LoadPayValue] FROM [CSITSS].[dbo].[LoadPayType] WHERE [CompanyDiv] = @.CompDiv AND [Deleted] = 0 AND [LoadPayType] = @.LoadPay)

IF THIS QUERY RETURNS NOTHING WHAT DOES IT SET @.PayTypeValue to?

NULL OR 0

why don't you try it and see for yourself:

SELECT @.PayTypeValue= [LoadPayValue] FROM [CSITSS].[dbo].[LoadPayType] WHERE 1=0
select @.PayTypeValue|||Also, try
SET @.PayTypeValue = 42
SELECT @.PayTypeValue= [LoadPayValue] FROM [CSITSS].[dbo].[LoadPayType] WHERE 1=0
select @.PayTypeValue

and see what happens.|||i thought it would return NULL.....|||But it returns...

The answer would be useful for people with similar questions ;)|||The answer is 42.
If the query returns no rows, the variable keeps its old value.|||Ahh that's clever - kinda like having an "else" value.
Cheers ivon|||hmmm...

That could be dangerous if you were using that variable in a loop.
I would wrap the SQL in ISNULL()

set @.somevariable=ISNULL((select somevalue from sometable),-9999999)
If @.somevariable=-9999999
'no rows were returned
Else|||That could be dangerous if you were using that variable in a loop.

How so? It retained it's initially declared value...
If you looped round, @.PayTypeValue would equal 42 each time..?|||Yes, but if you were expecting the value to change with each iteration...
What is returned from the select statement is also dependant on
@.compdiv and @.loadpay, so if those values change, it's quite possilbe that @.paytypevalue would change, too.|||Yes, but if you were expecting the value to change with each iteration...
That's how I found out; I got some very peculiar results.

BTW using IsNull() won't help: the query returns no rows, so there is no null value to replace with something else.

Solutions I'm using are
- Setting the variable to a default value before filling it with the query,
- Checking @.@.ROWCOUNT to see if any rows were returned from the query.|||I think it all depends on how you put it together.

declare @.tmp integer
set @.tmp=42
set @.tmp=isnull((select 18 where 1=0),0)
select @.tmp

Returns 0, which is what I'd expect, since
SELECT 18 WHERE 1=0
returns no rows|||How do I use @.@.ROWCOUNT to do this?

I haven't set this variable to anything before this and at least this instance doesn't loop. This SP is called once per order and checks 14 different things. Then feeds the results into a verification table. Those results and then selected by Crystal Reports and displayed to the user for an entire batch of orders one at a time by order number.|||RedNeckGeek: I now see that you put the isnull around the entire query.

tdecker81:
Something like
SELECT @.l_var = value
FROM table
WHERE <conditions>

SELECT @.l_records = @.@.ROWCOUNT

IF @.l_records > 0
BEGIN
' Do stuff with @.l_var
END|||Interesting. Since I rarely use the first syntax, I was unaware of this behavior:
set nocount on

declare @.MyValue int
set @.MyValue = 42

--This method retains @.MyValue
select @.MyValue = id from sysobjects where 1 = 0
select @.MyValue as 'Unchanged!'

--This method sets @.MyValue to NULL
set @.MyValue = (select id from sysobjects where 1 = 0)
select @.MyValue as 'Set to NULL!'

Learn something new every day...|||Learn something new every day...

my problem is I forget 2 somethings every day, so I think I'm losing the battle...

(most of it is stuff my wife tells me so I guess it's ok)

:)|||I'm sure you're wife will be there to constantly remind you too.sql

If Not Exists?

Curious about the above:
If there is a query that says
If not exists(select * from table)
versus one that says
If not exists(select * from table with(NoLOCK))
Is the second statement more correct than the first (considering that there
may be hundreds of hits to that table in a very short space of time -
possible 100's per second)?
Or is the second statement truly no different than the first as the
statement would discover that the record had a count > 0 and thus validate
the "if not exists" statment as false?
Regards,
Jamie
On Mon, 30 Jul 2007 11:02:05 -0700, thejamie wrote:

>Curious about the above:
>If there is a query that says
>If not exists(select * from table)
>versus one that says
>If not exists(select * from table with(NoLOCK))
>Is the second statement more correct than the first (considering that there
>may be hundreds of hits to that table in a very short space of time -
>possible 100's per second)?
Hi thejamie,
The seconds statement is faster, but LESS correct. If the table has no
rows, one user proceeds to insert a row that violates a constraint (so
that the insert will be rolled back) and another user runs the second
version of the query, it will "see" the row inserted by the first user,
even though that row logically never existed. And the revere goes to: if
one user runs a DELETE without WHERE clause that gets rolled back later,
the query with nolock hint will temporarily see no rows, even though
they logically were never gone.
Hugo Kornelis, SQL Server MVP
My SQL Server blog: http://sqlblog.com/blogs/hugo_kornelis
|||Yes. LESS correct, unfortunately it is the transaction table - roughly 2 or
three million of these a week - it is hard to touch this table without
conflicts - we sort of gave up and now use the with(nolock) when touching the
table. The issue came up as this particular call to the transactions table
brought up the question of what does the "EXISTS" keyword actually do when it
accesses a table.
For example, does it open the PK index to see if it has a count and shut it
back down again?
or possibly:
Opens the table like a select top 1 call might do,
or worst possibly scenario - "EXISTS" opens the entire index and scans
through from beginning to end to determine the condition as true or false.
What is actually written is " IF NOT EXISTS " which flowed more logically -
from the context - if the table does not exist - which at about 2:30 AM in
the morning when it gets archived to the datawarehouse - it essentially does
not exist from that point until about 5 am when the warehouse starts up -
question remains:
Is the table accessing all the records with the "Exists" keyword, or does it
try to scan the entire index... etc?
Regards,
Jamie
"Hugo Kornelis" wrote:

> On Mon, 30 Jul 2007 11:02:05 -0700, thejamie wrote:
>
> Hi thejamie,
> The seconds statement is faster, but LESS correct. If the table has no
> rows, one user proceeds to insert a row that violates a constraint (so
> that the insert will be rolled back) and another user runs the second
> version of the query, it will "see" the row inserted by the first user,
> even though that row logically never existed. And the revere goes to: if
> one user runs a DELETE without WHERE clause that gets rolled back later,
> the query with nolock hint will temporarily see no rows, even though
> they logically were never gone.
> --
> Hugo Kornelis, SQL Server MVP
> My SQL Server blog: http://sqlblog.com/blogs/hugo_kornelis
>
|||On Tue, 31 Jul 2007 06:02:05 -0700, thejamie wrote:

>Yes. LESS correct, unfortunately it is the transaction table - roughly 2 or
>three million of these a week - it is hard to touch this table without
>conflicts - we sort of gave up and now use the with(nolock) when touching the
>table. The issue came up as this particular call to the transactions table
>brought up the question of what does the "EXISTS" keyword actually do when it
>accesses a table.
>For example, does it open the PK index to see if it has a count and shut it
>back down again?
>or possibly:
>Opens the table like a select top 1 call might do,
>or worst possibly scenario - "EXISTS" opens the entire index and scans
>through from beginning to end to determine the condition as true or false.
>What is actually written is " IF NOT EXISTS " which flowed more logically -
>from the context - if the table does not exist - which at about 2:30 AM in
>the morning when it gets archived to the datawarehouse - it essentially does
>not exist from that point until about 5 am when the warehouse starts up -
>question remains:
>Is the table accessing all the records with the "Exists" keyword, or does it
>try to scan the entire index... etc?
Hi thejamie,
Both EXISTS and NOT EXISTS will stop processing as soon as the first row
matching the WHERE clause (if any) is found.
Hugo Kornelis, SQL Server MVP
My SQL Server blog: http://sqlblog.com/blogs/hugo_kornelis
|||On Jul 30, 1:02 pm, thejamie <theja...@.discussions.microsoft.com>
wrote:
> Curious about the above:
> If there is a query that says
> If not exists(select * from table)
> versus one that says
> If not exists(select * from table with(NoLOCK))
> Is the second statement more correct than the first (considering that there
> may be hundreds of hits to that table in a very short space of time -
> possible 100's per second)?
> Or is the second statement truly no different than the first as the
> statement would discover that the record had a count > 0 and thus validate
> the "if not exists" statment as false?
> --
> Regards,
> Jamie
Suggestion:
Try using Select 1 instead of Select * in this scenario. That is an
old db tuning trick. Let's it use whatever index fits the where
clause and doesn't have to go to the table, retrieve and subsequently
discard all of the data in the found rows.
|||On Wed, 01 Aug 2007 17:12:50 -0700, karlag92 wrote:
[vbcol=seagreen]
>On Jul 30, 1:02 pm, thejamie <theja...@.discussions.microsoft.com>
>wrote:
(snip)
>Suggestion:
>Try using Select 1 instead of Select * in this scenario. That is an
>old db tuning trick.
Hi karlag92,
The trick is, in fact, so old that it doesn't apply anymore. And it
actually never has applied for SQL Server. It was, IIRC, either Oracle
or DB2 that erroneously decided to expand the * to a column list even if
it was part of a [NOT] EXISTS subquery - and that has of course long be
fixed.
Hugo Kornelis, SQL Server MVP
My SQL Server blog: http://sqlblog.com/blogs/hugo_kornelis

If Not Exists?

Curious about the above:
If there is a query that says
If not exists(select * from table)
versus one that says
If not exists(select * from table with(NoLOCK))
Is the second statement more correct than the first (considering that there
may be hundreds of hits to that table in a very short space of time -
possible 100's per second)?
Or is the second statement truly no different than the first as the
statement would discover that the record had a count > 0 and thus validate
the "if not exists" statment as false?
--
Regards,
JamieOn Mon, 30 Jul 2007 11:02:05 -0700, thejamie wrote:

>Curious about the above:
>If there is a query that says
>If not exists(select * from table)
>versus one that says
>If not exists(select * from table with(NoLOCK))
>Is the second statement more correct than the first (considering that there
>may be hundreds of hits to that table in a very short space of time -
>possible 100's per second)?
Hi thejamie,
The seconds statement is faster, but LESS correct. If the table has no
rows, one user proceeds to insert a row that violates a constraint (so
that the insert will be rolled back) and another user runs the second
version of the query, it will "see" the row inserted by the first user,
even though that row logically never existed. And the revere goes to: if
one user runs a DELETE without WHERE clause that gets rolled back later,
the query with nolock hint will temporarily see no rows, even though
they logically were never gone.
Hugo Kornelis, SQL Server MVP
My SQL Server blog: http://sqlblog.com/blogs/hugo_kornelis|||Yes. LESS correct, unfortunately it is the transaction table - roughly 2 or
three million of these a week - it is hard to touch this table without
conflicts - we sort of gave up and now use the with(nolock) when touching th
e
table. The issue came up as this particular call to the transactions table
brought up the question of what does the "EXISTS" keyword actually do when i
t
accesses a table.
For example, does it open the PK index to see if it has a count and shut it
back down again?
or possibly:
Opens the table like a select top 1 call might do,
or worst possibly scenario - "EXISTS" opens the entire index and scans
through from beginning to end to determine the condition as true or false.
What is actually written is " IF NOT EXISTS " which flowed more logically -
from the context - if the table does not exist - which at about 2:30 AM in
the morning when it gets archived to the datawarehouse - it essentially does
not exist from that point until about 5 am when the warehouse starts up -
question remains:
Is the table accessing all the records with the "Exists" keyword, or does it
try to scan the entire index... etc?
--
Regards,
Jamie
"Hugo Kornelis" wrote:

> On Mon, 30 Jul 2007 11:02:05 -0700, thejamie wrote:
>
> Hi thejamie,
> The seconds statement is faster, but LESS correct. If the table has no
> rows, one user proceeds to insert a row that violates a constraint (so
> that the insert will be rolled back) and another user runs the second
> version of the query, it will "see" the row inserted by the first user,
> even though that row logically never existed. And the revere goes to: if
> one user runs a DELETE without WHERE clause that gets rolled back later,
> the query with nolock hint will temporarily see no rows, even though
> they logically were never gone.
> --
> Hugo Kornelis, SQL Server MVP
> My SQL Server blog: http://sqlblog.com/blogs/hugo_kornelis
>|||On Tue, 31 Jul 2007 06:02:05 -0700, thejamie wrote:

>Yes. LESS correct, unfortunately it is the transaction table - roughly 2 o
r
>three million of these a week - it is hard to touch this table without
>conflicts - we sort of gave up and now use the with(nolock) when touching t
he
>table. The issue came up as this particular call to the transactions table
>brought up the question of what does the "EXISTS" keyword actually do when
it
>accesses a table.
>For example, does it open the PK index to see if it has a count and shut it
>back down again?
>or possibly:
>Opens the table like a select top 1 call might do,
>or worst possibly scenario - "EXISTS" opens the entire index and scans
>through from beginning to end to determine the condition as true or false.
>What is actually written is " IF NOT EXISTS " which flowed more logically -
>from the context - if the table does not exist - which at about 2:30 AM in
>the morning when it gets archived to the datawarehouse - it essentially doe
s
>not exist from that point until about 5 am when the warehouse starts up -
>question remains:
>Is the table accessing all the records with the "Exists" keyword, or does i
t
>try to scan the entire index... etc?
Hi thejamie,
Both EXISTS and NOT EXISTS will stop processing as soon as the first row
matching the WHERE clause (if any) is found.
Hugo Kornelis, SQL Server MVP
My SQL Server blog: http://sqlblog.com/blogs/hugo_kornelis|||On Jul 30, 1:02 pm, thejamie <theja...@.discussions.microsoft.com>
wrote:
> Curious about the above:
> If there is a query that says
> If not exists(select * from table)
> versus one that says
> If not exists(select * from table with(NoLOCK))
> Is the second statement more correct than the first (considering that ther
e
> may be hundreds of hits to that table in a very short space of time -
> possible 100's per second)?
> Or is the second statement truly no different than the first as the
> statement would discover that the record had a count > 0 and thus validate
> the "if not exists" statment as false?
> --
> Regards,
> Jamie
Suggestion:
Try using Select 1 instead of Select * in this scenario. That is an
old db tuning trick. Let's it use whatever index fits the where
clause and doesn't have to go to the table, retrieve and subsequently
discard all of the data in the found rows.|||On Wed, 01 Aug 2007 17:12:50 -0700, karlag92 wrote:

>On Jul 30, 1:02 pm, thejamie <theja...@.discussions.microsoft.com>
>wrote:
(snip)[vbcol=seagreen]
>Suggestion:
>Try using Select 1 instead of Select * in this scenario. That is an
>old db tuning trick.
Hi karlag92,
The trick is, in fact, so old that it doesn't apply anymore. And it
actually never has applied for SQL Server. It was, IIRC, either Oracle
or DB2 that erroneously decided to expand the * to a column list even if
it was part of a [NOT] EXISTS subquery - and that has of course long be
fixed.
Hugo Kornelis, SQL Server MVP
My SQL Server blog: http://sqlblog.com/blogs/hugo_kornelis

If Not Exists?

Curious about the above:
If there is a query that says
If not exists(select * from table)
versus one that says
If not exists(select * from table with(NoLOCK))
Is the second statement more correct than the first (considering that there
may be hundreds of hits to that table in a very short space of time -
possible 100's per second)?
Or is the second statement truly no different than the first as the
statement would discover that the record had a count > 0 and thus validate
the "if not exists" statment as false?
--
Regards,
JamieOn Mon, 30 Jul 2007 11:02:05 -0700, thejamie wrote:
>Curious about the above:
>If there is a query that says
>If not exists(select * from table)
>versus one that says
>If not exists(select * from table with(NoLOCK))
>Is the second statement more correct than the first (considering that there
>may be hundreds of hits to that table in a very short space of time -
>possible 100's per second)?
Hi thejamie,
The seconds statement is faster, but LESS correct. If the table has no
rows, one user proceeds to insert a row that violates a constraint (so
that the insert will be rolled back) and another user runs the second
version of the query, it will "see" the row inserted by the first user,
even though that row logically never existed. And the revere goes to: if
one user runs a DELETE without WHERE clause that gets rolled back later,
the query with nolock hint will temporarily see no rows, even though
they logically were never gone.
--
Hugo Kornelis, SQL Server MVP
My SQL Server blog: http://sqlblog.com/blogs/hugo_kornelis|||Yes. LESS correct, unfortunately it is the transaction table - roughly 2 or
three million of these a week - it is hard to touch this table without
conflicts - we sort of gave up and now use the with(nolock) when touching the
table. The issue came up as this particular call to the transactions table
brought up the question of what does the "EXISTS" keyword actually do when it
accesses a table.
For example, does it open the PK index to see if it has a count and shut it
back down again?
or possibly:
Opens the table like a select top 1 call might do,
or worst possibly scenario - "EXISTS" opens the entire index and scans
through from beginning to end to determine the condition as true or false.
What is actually written is " IF NOT EXISTS " which flowed more logically -
from the context - if the table does not exist - which at about 2:30 AM in
the morning when it gets archived to the datawarehouse - it essentially does
not exist from that point until about 5 am when the warehouse starts up -
question remains:
Is the table accessing all the records with the "Exists" keyword, or does it
try to scan the entire index... etc?
--
Regards,
Jamie
"Hugo Kornelis" wrote:
> On Mon, 30 Jul 2007 11:02:05 -0700, thejamie wrote:
> >Curious about the above:
> >
> >If there is a query that says
> >If not exists(select * from table)
> >versus one that says
> >If not exists(select * from table with(NoLOCK))
> >
> >Is the second statement more correct than the first (considering that there
> >may be hundreds of hits to that table in a very short space of time -
> >possible 100's per second)?
> Hi thejamie,
> The seconds statement is faster, but LESS correct. If the table has no
> rows, one user proceeds to insert a row that violates a constraint (so
> that the insert will be rolled back) and another user runs the second
> version of the query, it will "see" the row inserted by the first user,
> even though that row logically never existed. And the revere goes to: if
> one user runs a DELETE without WHERE clause that gets rolled back later,
> the query with nolock hint will temporarily see no rows, even though
> they logically were never gone.
> --
> Hugo Kornelis, SQL Server MVP
> My SQL Server blog: http://sqlblog.com/blogs/hugo_kornelis
>|||On Tue, 31 Jul 2007 06:02:05 -0700, thejamie wrote:
>Yes. LESS correct, unfortunately it is the transaction table - roughly 2 or
>three million of these a week - it is hard to touch this table without
>conflicts - we sort of gave up and now use the with(nolock) when touching the
>table. The issue came up as this particular call to the transactions table
>brought up the question of what does the "EXISTS" keyword actually do when it
>accesses a table.
>For example, does it open the PK index to see if it has a count and shut it
>back down again?
>or possibly:
>Opens the table like a select top 1 call might do,
>or worst possibly scenario - "EXISTS" opens the entire index and scans
>through from beginning to end to determine the condition as true or false.
>What is actually written is " IF NOT EXISTS " which flowed more logically -
>from the context - if the table does not exist - which at about 2:30 AM in
>the morning when it gets archived to the datawarehouse - it essentially does
>not exist from that point until about 5 am when the warehouse starts up -
>question remains:
>Is the table accessing all the records with the "Exists" keyword, or does it
>try to scan the entire index... etc?
Hi thejamie,
Both EXISTS and NOT EXISTS will stop processing as soon as the first row
matching the WHERE clause (if any) is found.
--
Hugo Kornelis, SQL Server MVP
My SQL Server blog: http://sqlblog.com/blogs/hugo_kornelis|||On Jul 30, 1:02 pm, thejamie <theja...@.discussions.microsoft.com>
wrote:
> Curious about the above:
> If there is a query that says
> If not exists(select * from table)
> versus one that says
> If not exists(select * from table with(NoLOCK))
> Is the second statement more correct than the first (considering that there
> may be hundreds of hits to that table in a very short space of time -
> possible 100's per second)?
> Or is the second statement truly no different than the first as the
> statement would discover that the record had a count > 0 and thus validate
> the "if not exists" statment as false?
> --
> Regards,
> Jamie
Suggestion:
Try using Select 1 instead of Select * in this scenario. That is an
old db tuning trick. Let's it use whatever index fits the where
clause and doesn't have to go to the table, retrieve and subsequently
discard all of the data in the found rows.|||On Wed, 01 Aug 2007 17:12:50 -0700, karlag92 wrote:
>On Jul 30, 1:02 pm, thejamie <theja...@.discussions.microsoft.com>
>wrote:
>> Curious about the above:
>> If there is a query that says
>> If not exists(select * from table)
>> versus one that says
>> If not exists(select * from table with(NoLOCK))
(snip)
>Suggestion:
>Try using Select 1 instead of Select * in this scenario. That is an
>old db tuning trick.
Hi karlag92,
The trick is, in fact, so old that it doesn't apply anymore. And it
actually never has applied for SQL Server. It was, IIRC, either Oracle
or DB2 that erroneously decided to expand the * to a column list even if
it was part of a [NOT] EXISTS subquery - and that has of course long be
fixed.
--
Hugo Kornelis, SQL Server MVP
My SQL Server blog: http://sqlblog.com/blogs/hugo_kornelis

IF NOT EXISTS problem

Hi,

I am migrating a project from SQL to SQL Compact Edition and the following statement keeps failing in the CE project:

Code Snippet

IF NOT EXISTS (SELECT * FROM Court2 WHERE BookingDate = '2007-05-28') INSERT INTO Court2 (BookingDate,T1100) VALUES ('2007-05-28',52) ELSE UPDATE Court2 SET T1100 = 52 WHERE (BookingDate = '2007-05-28')

It works fine in SQL.

I've done a fair bit of searching for the solution and it appears my syntax is not perfect but I can't see where.

Any suggestions.

Here's the error that CE produces:

Code Snippet

There was an error parsing the query. [ Token line number = 1,Token line offset = 1,Token in error = IF ]

Thanks,

Glen.

Hi Glen,

IF.. ELSE is not available in SQL CE, as only a subset of the full T-SQL grammar is supported by SQL CE,

so you will have to do this in code, like:

Get a DataReader with

Code Snippet

SELECT * FROM Court2 WHERE BookingDate = '2007-05-28'

and perform your insert or update depending on the result of this.

For documentation on SQL CE SQL syntax see: http://msdn2.microsoft.com/en-us/library/ms173372.aspx

|||

Thank you.

I'm now working on the next issue:

Unfortunately I'm only a hacker and learning the hard way .. Is there somewhere that I can go that lists the differences and workarounds for the CE that I can read.

Cheers.

|||See SQL CE Compact Edition BOL, - for documentation on SQL CE SQL syntax see: http://msdn2.microsoft.com/en-us/library/ms173372.aspx

Friday, March 30, 2012

If numeric query

If numeric query

If Nothing Selected Into Variable What Is The Value Of Variable?

If Not Exists?

If Not Exists?

If Not Exists?

IF NOT EXISTS problem

Identity column

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