Re: constraint problem

On Mon, 25 Jul 2005, [iso-8859-1] Martín Marqués wrote:

> I have a table with a login, password and confirmed columns (besides others),
> and I'm having so trouble getting this contraint to work.
>
> The account is created with login and password NULL and confirmed set to
> false. Once the user gives the app he's login and password (login is unique)
> the system updates that row with the new login, password and sets confirmed
> to true.
>
> Now to the constraint:
>
> I don't want the login and password columns to have nulls when the account
> (row) is confirmed (confirmed column is set to true).
>
> I tried adding this CONSTRAINT to the table definition, but with no luck:
>
>     CONSTRAINT nonuloconfirmado CHECK
>         ((login NOT NULL AND password NOT NULL) OR NOT confirmado)
>
> It gives an error on the first NULL.
>
> How can this be solved?

I think you'd want
(login IS NOT NULL AND password IS NOT NULL) OR NOT confirmado