Tom Ansley <tansley(at)law(dot)du(dot)edu> writes:
> I have.....
> SELECT * FROM foo where true = false;
> Is this as good as the answer below or does it do an entire table scan?
Yeah, that will work (actually you could simplify it to "WHERE false").
However the "LIMIT 0" variant might be a little easier to attach to a
prespecified query, which might already have some WHERE clauses.
regards, tom lane