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List:       postgresql-sql
Subject:    Re: [SQL] UPDATE & LIMIT together?
From:       Bruce Momjian <pgman () candle ! pha ! pa ! us>
Date:       2002-08-28 17:01:36
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You have to use a subquery returning the tables primary key to the
UPDATE:

	UPDATE tab SET x=1
	WHERE (primkey, col) IN (
		SELECT primkey,col FROM tab 
		ORDER BY col 
		LIMIT 10)

---------------------------------------------------------------------------

tp wrote:
-- Start of PGP signed section.
> Hi
> 
> I want to SELECT at max. 10 rows and SET a variable for the
> select 10 rows with the same query.
> 
> Under mysql i can use:
> UPDATE table SET uniq_iq=12345 LIMIT 10
> SELECT * FROM table WHERE uniq_id=1234;
> 
> This is not supported by postgres.
> 
> Is there some easy solution that does not require locking?
> 
> 
> -tp
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-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman@candle.pha.pa.us               |  (610) 359-1001
  +  If your life is a hard drive,     |  13 Roberts Road
  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073

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