Re: sql group by statement
От | Jean-Luc Lachance |
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Тема | Re: sql group by statement |
Дата | |
Msg-id | 3D8206A1.1B5B04FA@nsd.ca обсуждение исходный текст |
Ответ на | sql group by statement ("Albrecht Berger" <berger1517@gmx.ch>) |
Список | pgsql-sql |
How about: select * from <Table> where (id, val2) in ( select id, max(val2) from <Table> group by id); JLL Albrecht Berger wrote: > > Hello, > I have a problem, which I'm not able to solve with a simple query : > > I need a resultset with distinct id's, but the max val2 of each id. > I tried to group by id, but though I need the pk in my resultset > I have to group it too, which "destroys" the group of val2. > > Can this be done without a huge query ? > > Table : > pk id val1 val2 > 1 1 2 3 > 2 1 2 4 > 3 2 1 1 > 4 1 0 5 > 5 2 1 8 > > > Needed Result : > pk id val1 val2 > 4 1 0 5 > 5 2 1 8 > > > Thx > berger > > ---------------------------(end of broadcast)--------------------------- > TIP 6: Have you searched our list archives? > > http://archives.postgresql.org
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