How can I use if statement after a CTE (SQL Server 2005)

Question

Last night I was writing a simple T-SQL program something like this

DECLARE @ROLEID AS INT

SELECT @ROLEID = [ROLE ID] FROM TBLROLE

;WITH CTE
AS
( 
    SELE         


        

Answer 1

Common table expressions are defined within the context of a single statement:

WITH cte_name AS (
  )
;

So you can do something like:

WITH CTE
AS
( 
    SELECT * FROM SOMETABLE
)
SELECT * FROM CTE;

or

WITH CTE
AS
( 
    SELECT * FROM SOMETABLE
)
UPDATE CTE 
SET somefield = somevalue
WHERE id = somekey;

A CTE must be followed by a single SELECT, INSERT, UPDATE, MERGE, or DELETE statement that references some or all the CTE columns. A CTE can also be specified in a CREATE VIEW statement as part of the defining SELECT statement of the view