> Is this Ok and I have to re-write query as
> vac=> select count(*) from test t2 where exists 
>                                 ^^
> (select t1.y from test t1 where t1.y = t2.x);
>                                        ^^^
> to get correlated one ?

Yes

Fri, 6 Feb 1998 17:31:26 +0100
Zeugswetter Andreas DBT <Andreas.Zeugswetter@telecom.at>
Re: what standard say ...