Re: questions about query design

Ottavio Campana wrote:
> Here's an example of what I'm doing: I have a table like
>
> create table (
>   id serial,
>   description text not null,
>   active boolean default true);
>
> What I want to do is a function inserting a new item into the table
> ensuring that there is only one record in the table having a particular
> description and at the same time the active field set to true (it might
> seem stupid, but the application requires it).

Assuming active can't be NULL, what's wrong with a UNIQUE constraint on
(description, active)?

--
Alban Hertroys
alban@magproductions.nl

magproductions b.v.

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