Re: DISTINCT ON not working...? - Mailing list pgsql-sql

From Phillip Smith
Subject Re: DISTINCT ON not working...?
Date
Msg-id 00e601c754a8$b2428010$9b0014ac@wbaus090
Whole thread Raw
In response to Re: DISTINCT ON not working...?  (Tom Lane <tgl@sss.pgh.pa.us>)
List pgsql-sql
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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