Re: Prevent double entries ... no simple unique index
От | Andreas Kretschmer |
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Тема | Re: Prevent double entries ... no simple unique index |
Дата | |
Msg-id | 20120712051445.GA5421@tux обсуждение исходный текст |
Ответ на | Re: Prevent double entries ... no simple unique index ("Marc Mamin" <M.Mamin@intershop.de>) |
Ответы |
Re: Prevent double entries ... no simple unique index
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Список | pgsql-sql |
Marc Mamin <M.Mamin@intershop.de> wrote: > > > > Or this one: > > > > test=*# create unique index on log((case when state = 0 then 0 when > > state = 1 then 1 else null end)); > > CREATE INDEX > > > > > > Now you can insert one '0' and one '1' - value - but no more. > > Hi, > > A partial index would do the same, but requires less space: > > create unique index on log(state) WHERE state IN (0,1); Right! ;-) Andreas -- Really, I'm not out to destroy Microsoft. That will just be a completely unintentional side effect. (Linus Torvalds) "If I was god, I would recompile penguin with --enable-fly." (unknown) Kaufbach, Saxony, Germany, Europe. N 51.05082°, E 13.56889°
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