Re: CHECK Constraints

On Fri, Apr 22, 2005 at 12:02:41 -0400,
"Van Ingen, Lane" <lvaningen(at)ESNCC(dot)com> wrote:
> Hi all,
> the 8.0 manual says CHECK can be used in the following manner:
> CHECK (expression)
> The only stipulations are that it must produce a boolean result (true or unknown) to succeed.
>
> If I were to specify a the following on a field named price in one expression, would it succeed?
> CHECK (price = 1 OR price = 2 OR price = 3)
>
> In other words, I would want to raise an exception on any other value other than 1, 2, or 3. Can
> this be done? All of the examples in the manual show a single check (like price > 0) .

Yes, you can do that.