From: ries@jongert.nl
To: pgsql-sql@postgresql.org
Subject: Re: partial unique constraint
Date: Tue, 6 Apr 2004 17:05:37 +0200
Message-ID: <001601c41be8$9ece4f60$fd01000a@IT001> (raw)
In-Reply-To: <1081261772.31785.48.camel@camel>
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
>
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-sql@postgresql.org
Cc: ries@jongert.nl
Subject: Re: partial unique constraint
In-Reply-To: <001601c41be8$9ece4f60$fd01000a@IT001>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox