How do you UNION with multiple CTEs?

Question

How do you use UNION with multiple Common Table Expressions?

I\'m trying to put together some summary numbers but no matter where I put the

Answer 1

You can do it like this:

WITH    [Clients]
          AS ( SELECT   Client_No
               FROM     dbo.Decision_Data
               GROUP BY Client_No
               HAVING   COUNT(*) = 1
             ),
        [Clients2]
          AS ( SELECT   Client_No
               FROM     dbo.Decision_Data
               GROUP BY Client_No
               HAVING   COUNT(*) = 1
             )
SELECT  COUNT(*)
FROM    Clients
UNION
SELECT  COUNT(*)
FROM    Clients2;