RE: SQL: CASE WHEN EXISTS Problem

[Tom E Stieger <testieger@xxxxxxxxxxxx>]

Sam-

My orignal SQL view had multiple when clauses in the case staement to output a text string based on the different conditions.  In my example I used SYSDUMMY1 to simplify it.  In my second SQL it is using a union to get 2 records in the results set.


-Tom 

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Lennon_s_j@xxxxxxxxxxx
Sent: Friday, March 18, 2011 3:32 PM
To: midrange-l@xxxxxxxxxxxx
Subject: Re: SQL: CASE WHEN EXISTS Problem

Could it be two (or more) records in SYSIBM.SYSDUMMY1?  There should be just one.

Sam

On 3/18/2011 3:12 PM, Tom E Stieger wrote:
> 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
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