Re: Deferrable Unique Constraints

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От Tom Lane
Тема Re: Deferrable Unique Constraints
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Msg-id 19003.1106769473@sss.pgh.pa.us
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Ответ на Re: Deferrable Unique Constraints  (Greg Stark <gsstark@mit.edu>)
Ответы Re: Deferrable Unique Constraints  (Greg Stark <gsstark@mit.edu>)
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Greg Stark <gsstark@mit.edu> writes:
> Off the top of my head it seems the way to go about doing this would be to
> simply not insert the records in the index until commit time. This doesn't
> actually sound so hard, is there any problem with this approach?

Yeah:begin;insert into foo (key, ...) values (33, ...);select * from foo where key = 33;...

If the SELECT uses an indexscan it will fail to find the just-inserted
row.
        regards, tom lane


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