Reuse results from SQL Server common table expression

Question

I have a query to retrieve all the modules and child modules for a page, using a common table expression. Is it possible to use the results from the cte more than once?

Answer 1

Use like following :

Create FUNCTION [dbo].[fnGetAllData] 
(
    @UserId int    
)
RETURNS TABLE
AS
RETURN  
(
    WITH UserPRecursive AS
    (   
    SELECT u.userid,u.OverrideID
    FROM UserOverride u where OverrideID=@UserId
    UNION ALL
    SELECT C.userid,C.OverrideID
    FROM UserOverride AS C INNER JOIN UserPRecursive AS cr
    ON C.OverrideID = cr.userid 
    )   
    , UserCRecursive AS
    (   
    SELECT u.userid,u.OverrideID
    FROM UserOverride u where UserID=@UserId
    UNION ALL
    SELECT C.userid,C.OverrideID
    FROM UserOverride AS C INNER JOIN UserCRecursive AS cr
    ON C.userid = cr.OverrideID 
    )
    SELECT distinct CR1.userid as userId FROM UserPRecursive AS CR1
    UNION ALL
    SELECT distinct cr2.OverrideID as userId FROM UserCRecursive AS CR2 
    UNION ALL
    select userid from [User] where UserID=@UserId
)