If Condition In Select Statement...

Hi,
I need to write an if condition in SELECT statement. Below is the code for the same. But its throwing error. Can some refine the code below.

SELECT tblCustomer.Customer_LegalName,
(IF (tblCustomer.IsNRACustomer = TRUE) SELECT tblCustomer.Customer_PassportNo ELSE
ISNULL(tblCustomer.Customer_TaxId, tblCustomer.Customer_PassportNo)) AS TAXID,

tblCustomer.Customer_DoingBusinessAs, tblSeed_EDDCategory.CategoryName, '2' AS DCS, tblUser_OfficerCode.User_OfficerCode,
tblCustomer.Customer_AreaId, tblCustomer.Customer_BranchId, CONVERT(VARCHAR(11), tblCustomer_EDDCategory.CreateDate)
AS CreateDate, tblSeed_EDDCategory.EDDCategoryId, tblCustomer_EDDCategory.Category_CreateEmpId,
tblCustomer_EDDCategory.CustCatId, tblCustomer.Customer_Id, tblSeed_Area.AreaName, tblSeed_Employee.Name,
tblUser_OfficerCode.User_OfficerName, tblCustomer.Customer_TaxId, tblCustomer.IsNRACustomer,
tblCustomer.Customer_PassportNo
FROM tblCustomer INNER JOIN
blCustomer_EDDCategory ON tblCustomer.Customer_Id = tblCustomer_EDDCategory.CustomerId INNER JOIN
tblSeed_EDDCategory ON tblCustomer_EDDCategory.EDDCategoryId = tblSeed_EDDCategory.EDDCategoryId INNER JOIN
tblSeed_Employee ON tblCustomer.Customer_CreateEmpId = tblSeed_Employee.EmployeeId INNER JOIN
tblUser_OfficerCode ON tblCustomer.Customer_CreateEmpId = tblUser_OfficerCode.EmployeeId INNER JOIN
tblSeed_Area ON tblCustomer.Customer_AreaId = tblSeed_Area.AreaId

Thanks,
Rahul JhaIt might help if you checked for the correct syntax in Books Online...
Use a CASE statement int he SELECT clause:

SELECT tblCustomer.Customer_LegalName,
case tblCustomer.IsNRACustomer
when TRUE then tblCustomer.Customer_PassportNo
else ISNULL(tblCustomer.Customer_TaxId, tblCustomer.Customer_PassportNo)
end AS TAXID,
...

...but you are still going to have to define what "TRUE" is. What datatype is IsNRACustomer?|||Thanks Blindman :-)