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From: "Phillip Smith" <phillip.smith@weatherbeeta.com.au>
To: "'Tom Lane'" <tgl@sss.pgh.pa.us>
Cc: <pgsql-sql@postgresql.org>
Subject: Re: DISTINCT ON not working...? 
Date: Tue, 20 Feb 2007 15:36:32 +1100
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Removing the CASE statement all together:
SELECT  DISTINCT ON (ean)
	  ean,
	  count(*)
FROM    TMPTABLE
WHERE   code NOT IN (SELECT code FROM stock_deleted)
 AND    ean IS NOT NULL
GROUP BY ean

Still gives me:
	3246576919422	2


-----Original Message-----
From: Tom Lane [mailto:tgl@sss.pgh.pa.us] 
Sent: Tuesday, 20 February 2007 15:33
To: Phillip Smith
Cc: pgsql-sql@postgresql.org
Subject: Re: [SQL] DISTINCT ON not working...? 

Perhaps you've confused yourself by using "ean" as both an input and an
output column name?  I think that the "ean" in the DISTINCT ON clause
will effectively refer to that CASE-expression, whereas the one in the
WHERE clause is just referring to the underlying column (and thus making
the IS NULL test in the CASE rather pointless).

			regards, tom lane


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