On Mon, Aug 04, 2003 at 11:17:56 +0300,
evl(at)my-mail(dot)com(dot)ua wrote:
> Please help.
>
> Need a boolean function which returns true if given key in table is
> referensed from another table(s).
Use "exists" with a subselect. Something like:
select exists(select 1 from table where table.key = 'value');