You should create a functional index here.
Ries
> -----Oorspronkelijk bericht-----
> Van: pgsql-sql-owner@postgresql.org
> [mailto:pgsql-sql-owner@postgresql.org]Namens Robert Treat
> Verzonden: dinsdag 6 april 2004 16:30
> Aan: pgsql-sql@postgresql.org
> Onderwerp: [SQL] partial unique constraint
>
>
> Trying to come up with the proper syntax to meet the
> following criteria:
>
> create table foo (bar integer, baz boolean UNIQUE (bar, baz = true));
>
> note the above syntax is not correct, but should demonstrate what i'm
> trying to do; I want to add a unique constraint such that we
> only allow
> one case of bar and baz = true... i can have unlimited bar and baz =
> false, and there can be multiple bar and baz = true if the bars are
> different... did some doc reading and mail list searching but a valid
> syntax for this seems to be escaping me...
>
> btw I'm pretty sure I could do this with an external trigger, but am
> wondering about a constraint oriented approach
>
> Robert Treat
> --
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