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Reply-To: <gnanam@zoniac.com>
From: "Gnanakumar" <gnanam@zoniac.com>
To: <pgsql-sql@postgresql.org>
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Subject: Re: Is it possible to get DISTINCT rows from RETURNING clause?
Date: Fri, 18 Feb 2011 11:28:35 +0530
Organization: Zoniac Software Private Limited
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Any ideas?

-----Original Message-----
From: Gnanakumar [mailto:gnanam@zoniac.com] 
Sent: Thursday, February 17, 2011 12:36 PM
To: pgsql-sql@postgresql.org
Subject: Is it possible to get DISTINCT rows from RETURNING clause?

Hi,

Is it possible to get DISTINCT rows from an UPDATE statement using RETURNING
clause?

"MYTABLE" columns are:
	APRIMARYKEYCOLUMN
	ABOOLEANCOLUMN
	EMAIL
	COLUMN1
	COLUMN2
	COLUMN3

UPDATE using RETURNING clause query:
UPDATE MYTABLE SET ABOOLEANCOLUMN = true FROM MYTEMPTABLE WHERE EMAIL =
MYTEMPTABLE.EMAIL RETURNING EMAIL, COLUMN1, COLUMN2, COLUMN3;

Here in this case, I expect to return distinct rows from these columns:
EMAIL, COLUMN1, COLUMN2, COLUMN3. 

I even tried out some ways of getting distinct rows, but it doesn't work.
Though I can still solve this at application layer, I'm trying to find
whether this could be controlled at query-level.  Any different
ideas/suggestions are appreciated.

Regards,
Gnanam