Re: More efficient OR
От | Keith Worthington |
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Тема | Re: More efficient OR |
Дата | |
Msg-id | 20050216162747.M40986@narrowpathinc.com обсуждение исходный текст |
Ответ на | Re: More efficient OR (Sean Davis <sdavis2@mail.nih.gov>) |
Ответы |
Re: More efficient OR
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Список | pgsql-sql |
> > Hi All, > > > > In several of my SQL statements I have to use a WHERE clause > > that contains mutiple ORs. i.e. > > > > WHERE column1 = 'A' OR > > column1 = 'B' OR > > column1 = 'C' > > > > Is there a more efficient SQL statement that accomplishes the > > same limiting functionality? > > > > Kind Regards, > > Keith > > > > Scott wrote: > The in() construct is (nowadays) basically the same as > ORing multiple columns; > > where column1 in ('A','B','C') > > > Sean Davis wrote > Could 'in' or 'between' do what you want? I know that using 'in' > is equivalent to what you have below. Could 'between' be more > efficient--you could do explain analyze on various options to see > what the actual plan would be. > > Sean Thanks Scott and Sean for the post. It sounds like IN will save some typing and code space but not decrease the execution time. BETWEEN won't work for my real life query because the limiting values are quite disparate. Kind Regards, Keith
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