RE: CASE WHEN EXISTS Problem

Tom,

Use IFNULL instead of CASE?

SELECT IFNULL( ( SELECT 'I am awesome'
FROM SYSIBM/SYSDUMMY1
WHERE EXISTS( SELECT 1 FROM SYSIBM/SYSDUMMY1
UNION
SELECT 2 FROM SYSIBM/SYSDUMMY1 ) ),
'The computer has won')
FROM SYSIBM/SYSDUMMY1

Paul Morgan

Principal Programmer Analyst
IT Supply Chain/Replenishment

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Tom E Stieger
Sent: Friday, March 18, 2011 3:13 PM
To: 'Midrange Systems Technical Discussion'
Subject: SQL: CASE WHEN EXISTS Problem

I have an SQL view that is basically doing the following, in addition to a bunch of other stuff:

SELECT
CASE WHEN (SELECT 1 FROM SYSIBM.SYSDUMMY1) IS NOT NULL
THEN 'I am awesome'
ELSE 'The computer has won' END
FROM SYSIBM.SYSDUMMY1

This was working fine until the subselect ended up being 2 rows such as this:

SELECT
CASE WHEN (SELECT 1 FROM SYSIBM.SYSDUMMY1
UNION SELECT 2 FROM SYSIBM.SYSDUMMY1 ) IS NOT NULL
THEN 'I am awesome'
ELSE 'The computer has won' END
FROM SYSIBM.SYSDUMMY1

This gives the following Message: [SQL0811] Result of SELECT more than one row.

It looks like I should be able to use an EXISTS predicate, but I can't seem to get that to work either.

SELECT
CASE WHEN EXISTS (SELECT 1 FROM SYSIBM.SYSDUMMY1)
THEN 'I am awesome'
ELSE 'The computer has won' END
FROM SYSIBM.SYSDUMMY1

This gives the follwing Message: [SQL0104] Token EXISTS was not valid. Valid tokens: <IDENTIFIER> <INTEGER> <CHARSTRING> <GRAPHSTRING>

Using IN didn't work either, giving the following Message: [SQL0115] Comparison operator IN not valid.

I'm not quite sure what else to try, any help would be appreciated. Thanks.

-Tom Stieger
California Fine Wire