Re: partial unique constraint
От | |
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Тема | Re: partial unique constraint |
Дата | |
Msg-id | 001601c41be8$9ece4f60$fd01000a@IT001 обсуждение исходный текст |
Ответ на | partial unique constraint (Robert Treat <xzilla@users.sourceforge.net>) |
Список | pgsql-sql |
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 > -- > Build A Brighter Lamp :: Linux Apache {middleware} PostgreSQL > > > ---------------------------(end of > broadcast)--------------------------- > TIP 7: don't forget to increase your free space map settings >
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