To: pgsql-sql@postgresql.org
From: Thomas Kellerer <spam_eater@gmx.net>
Subject: Re: SQL conversion help
Date: Mon, 22 May 2017 08:30:50 +0200
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Ertan Küçükoğlu schrieb am 20.05.2017 um 06:01:
> I have below SQL script used in SQL Server. I would like some help to
> convert it into PostgreSQL format, please.
> 
> DECLARE @satirno INT 
> SET @satirno = 0
> UPDATE urtrecetedet
> SET @satirno = satirno = @satirno + 1
> WHERE recetekodu = 'ASD'

Assuming your primary key column is named ID, you can do it like this:

update urtrecetedet u
  set satirno = t.rn
from ( 
   select id, 
          row_number() over (order by id) as rn
   from urtrecetedet
   where recetekodu = 'ASD'
) t 
where t.id = u.id;


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