am Fri, dem 10.10.2008, um 12:38:24 +0100 mailte Jeng Yu folgendes: > Hi People! > > I'm doing an application and I've chosen postgresql > for the backend db. I need to use SQL update command > like this in my application: > > update mytable set x='20' where id='someid' order by > id limit 1; Du you have a primary key? If you don't have a pk, you can use the ctid: test=# create table a ( id int, val int); CREATE TABLE test=# insert into a values (1,1); INSERT 0 1 test=# insert into a values (1,1); INSERT 0 1 test=# insert into a values (1,1); INSERT 0 1 test=# select * from a; id | val ----+----- 1 | 1 1 | 1 1 | 1 (3 rows) test=# begin; BEGIN test=# update a set val=2 where ctid=(select ctid from a where id=1 limit 1); UPDATE 1 test=# select * from a; id | val ----+----- 1 | 1 1 | 1 1 | 2 (3 rows) Andreas -- Andreas Kretschmer Kontakt: Heynitz: 035242/47150, D1: 0160/7141639 (mehr: -> Header) GnuPG-ID: 0x3FFF606C, privat 0x7F4584DA http://wwwkeys.de.pgp.net
