Question

SQL Server 2005 Nested CASE Statement

Asked by: glennes

I can't get the syntax correct when trying to do a multiple CASE statement in this code:

SELECT CASE
         WHEN apitem.fcpocat = 'JO'
         THEN Left(apitem.fcsojokey,5)
         THEN
         CASE WHEN apitem.fcpocat = 'SO'
         THEN Left(apitem.fcsojokey,6)
         END AS 'JO'
         ELSE ''
       END AS 'SO',
       END ''
       apitem.finvqty,
       apitem.fpartno,
       Left(apitem.fpokey,6)   AS PO,
       Left(apitem.frecvkey,6) AS SO,
       apitem.fvucost,
       apitem.fvptdes,
       apitem.identity_column
FROM   apitem
WHERE  CASE
         WHEN apitem.fcpocat = 'JO'
         THEN Left(apitem.fcsojokey,5)
         THEN
         CASE WHEN apitem.fcpocat = 'SO'
         THEN Left(apitem.fcsojokey,6)
         END AS 'SO'
         ELSE ''
         END
           ELSE ''
       END <> ''

Both CASES are run against the same table.

The only difference is in the 'Left(apitem.fcsojokey,5)' and Left(apitem.fcsojokey,6) conditions.  The first one is to be used when apitem.fcpocat = 'JO'  and the second one when apitem.fcpocat = 'SO' .  I'm just having a problem working the syntax correctly to accommodate both conditions in the same SELECT clause.

How do I fix this so it will run?

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mwvisa1, Zone Advisor

                                  
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Asked On
2009-08-25 at 09:03:08ID24680338
Tags

SQL Server 2005

,

T-SQL

,

Nested Case Syntax

Topic

SQL Server 2005

Participating Experts
3
Points
500
Comments
5

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Answers

 

by: matthewspatrickPosted on 2009-08-25 at 09:10:27ID: 25179081

SELECT CASE
         WHEN apitem.fcpocat = 'JO' THEN Left(apitem.fcsojokey,5)
         WHEN apitem.fcpocat = 'SO' THEN Left(apitem.fcsojokey,6)
         ELSE ''
         END AS 'JO',
       apitem.finvqty,
       apitem.fpartno,
       Left(apitem.fpokey,6)   AS PO,
       Left(apitem.frecvkey,6) AS SO,
       apitem.fvucost,
       apitem.fvptdes,
       apitem.identity_column
FROM   apitem
WHERE apitem.fcpocat = 'JO' OR apitem.fcpocat = 'SO'

 

by: aneeshattingalPosted on 2009-08-25 at 09:10:40ID: 25179085

SELECT CASE WHEN apitem.fcpocat = 'JO' THEN Left(apitem.fcsojokey,5) ELSE '' END AS 'JO',
       CASE WHEN apitem.fcpocat = 'SO' THEN Left(apitem.fcsojokey,6) ELSE '' END AS 'SO',
       apitem.finvqty,
       apitem.fpartno,
       Left(apitem.fpokey,6)   AS PO,
       Left(apitem.frecvkey,6) AS SO,
       apitem.fvucost,
       apitem.fvptdes,
       apitem.identity_column
FROM   apitem
WHERE  apitem.fcpocat IN ('JO','SO')

 

by: VazgenPosted on 2009-08-25 at 09:14:05ID: 25179135

I think you missed condition strings

SELECT CASE
         WHEN apitem.fcpocat = 'JO'
         THEN Left(apitem.fcsojokey,5)

here must be a condition

         THEN
         CASE WHEN apitem.fcpocat = 'SO'
         THEN Left(apitem.fcsojokey,6)
         END AS 'JO'
         ELSE ''
       END AS 'SO',
       END ''
       apitem.finvqty,
       apitem.fpartno,
       Left(apitem.fpokey,6)   AS PO,
       Left(apitem.frecvkey,6) AS SO,
       apitem.fvucost,
       apitem.fvptdes,
       apitem.identity_column
FROM   apitem
WHERE  CASE
         WHEN apitem.fcpocat = 'JO'
         THEN Left(apitem.fcsojokey,5)

here must be a condition

         THEN
         CASE WHEN apitem.fcpocat = 'SO'
          THEN Left(apitem.fcsojokey,6)
          END AS 'SO'
          ELSE ''
          END
           ELSE ''
       END <> ''

 

by: glennesPosted on 2009-08-25 at 10:16:47ID: 25179828

matthewspatrick...Yours runs but does not return cases where JO is null and SO is not.
aneeshattingal...Yours works perfectly.
Vasgen...Yours errored out on the first SELECT line. (I commented out your comment lines before running it.)

 

by: glennesPosted on 2009-08-25 at 10:17:27ID: 31620243

Thanks...I appreciate it. Helped me learn how to do this correctly!

20120131-EE-VQP-002

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