How to use WITH clause with UNION ALL in SQL Server

Question

I'm trying but I don't know how to combine two SQL statements including the WITH clause with the UNION ALL. In each of the WITH SQL statements the difference is the WHERE clause.

WITH cte AS 
(
    SELECT 
        CMCONTRACTS.CMSERIALNUMBER, CMACTIVITIES.CMID, 
        CMACTIVITIES.CMSTART, CMACTIVITIES.CMFINISH, 
        CMACTIVITIES.CMSTATUSTYPE,
        ROW_NUMBER() OVER (PARTITION BY CMCONTRACTS.CMSERIALNUMBER 
                           ORDER BY CMACTIVITIES.CMFINISH DESC) RN
    FROM 
        CMACTIVITIES
    LEFT JOIN 
        CMCONTRACTS ON CMACTIVITIES.CMCONTRACTID = CMCONTRACTS.CMID
    WHERE 
        CMACTIVITIES.CMSTATUSTYPE = 3
)
SELECT 
    CMID, CMSTART, CMFINISH, CMSERIALNUMBER, CMSTATUSTYPE
FROM 
    cte
WHERE 
    RN = 1

UNION ALL

WITH cte AS 
(
    SELECT 
        CMCONTRACTS.CMSERIALNUMBER, CMACTIVITIES.CMID, 
        CMACTIVITIES.CMSTART, CMACTIVITIES.CMFINISH, 
        CMACTIVITIES.CMSTATUSTYPE,
        ROW_NUMBER() OVER (PARTITION BY CMCONTRACTS.CMSERIALNUMBER 
                           ORDER BY CMACTIVITIES.CMFINISH ASC) RN
    FROM 
        CMACTIVITIES
    LEFT JOIN 
        CMCONTRACTS ON CMACTIVITIES.CMCONTRACTID = CMCONTRACTS.CMID
    WHERE 
        CMACTIVITIES.CMSTATUSTYPE = '2'
)
SELECT 
    CMID, CMSTART, CMFINISH, CMSERIALNUMBER, CMSTATUSTYPE 
    -- GXSTARTDATE, GXENDDATE, GXFORMULA, GXPRLSID
FROM
    cte
WHERE 
    RN = 1

When I run it, I get the following error :

Msg 156, Level 15, State 1, Line 26
Incorrect syntax near the keyword 'WITH'.

Msg 319, Level 15, State 1, Line 26
Incorrect syntax near the keyword 'with'. If this statement is a common table expression, an xmlnamespaces clause or a change tracking context clause, the previous statement must be terminated with a semicolon.

Running these two separate SQL queries a take the expected result. But I want to take all results from both previous SQL queries including the WITH clause in one query.

Answer 1

You should first make the CTE's like this:

 WITH cte
AS (SELECT
          CMCONTRACTS.CMSERIALNUMBER,
          CMACTIVITIES.CMID,
          CMACTIVITIES.CMSTART,
          CMACTIVITIES.CMFINISH,
          CMACTIVITIES.CMSTATUSTYPE,
          ROW_NUMBER() OVER (PARTITION BY CMCONTRACTS.CMSERIALNUMBER
                             ORDER BY CMACTIVITIES.CMFINISH DESC
                            ) RN
    FROM  CMACTIVITIES
          LEFT JOIN CMCONTRACTS ON CMACTIVITIES.CMCONTRACTID = CMCONTRACTS.CMID
    WHERE CMACTIVITIES.CMSTATUSTYPE = 3),
     cte2
AS (SELECT
          CMCONTRACTS.CMSERIALNUMBER,
          CMACTIVITIES.CMID,
          CMACTIVITIES.CMSTART,
          CMACTIVITIES.CMFINISH,
          CMACTIVITIES.CMSTATUSTYPE,
          ROW_NUMBER() OVER (PARTITION BY CMCONTRACTS.CMSERIALNUMBER
                             ORDER BY CMACTIVITIES.CMFINISH ASC
                            ) RN
    FROM  CMACTIVITIES
          LEFT JOIN CMCONTRACTS ON CMACTIVITIES.CMCONTRACTID = CMCONTRACTS.CMID
    WHERE CMACTIVITIES.CMSTATUSTYPE = '2')
SELECT
      CMID,
      CMSTART,
      CMFINISH,
      CMSERIALNUMBER,
      CMSTATUSTYPE
FROM  cte
WHERE RN = 1
UNION ALL
SELECT
      CMID,
      CMSTART,
      CMFINISH,
      CMSERIALNUMBER,
      CMSTATUSTYPE -- GXSTARTDATE, GXENDDATE, GXFORMULA, GXPRLSID
FROM  cte2
WHERE RN = 1;