Re: Lowest 2 items per
От | Relyea, Mike |
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Тема | Re: Lowest 2 items per |
Дата | |
Msg-id | AF7D9319B29A0242A33C3BF843BD31330EFB8D61@USA7061MS03.na.xerox.net обсуждение исходный текст |
Ответ на | Re: Lowest 2 items per (David Johnston <polobo@yahoo.com>) |
Ответы |
Re: Lowest 2 items per
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Список | pgsql-sql |
> -----Original Message----- > From: David Johnston [mailto:polobo@yahoo.com] > Sent: Friday, June 01, 2012 11:13 AM > To: Relyea, Mike > Cc: <pgsql-sql@postgresql.org> > Subject: Re: [SQL] Lowest 2 items per > > > I would recommend using the "RANK" window function with an appropriate > partition clause in a sub-query then in the outer query you simply WHERE > rank <= 2 > > You will need to decide how to deal with ties. > > David J. David, I've never used window functions before and rank looks like it'd do the job quite nicely. Unfortunately I'm using 8.3 - which I should have mentioned in my original request but didn't. Window functions weren't introduced until 8.4 from what I can tell. Mike
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