On 4/13/2012 11:39 AM, Mike Blackwell wrote:
> Could someone please explain to me why the following select does not
> result in a syntax error? (9.0.3)
>
> begin;
>
> create table x( c1 integer , c2 integer);
> create table y( c3 integer, c4 integer);
>
> select * from x where c2 in ( select c2 from y where c4 = 2 );
>
>
> rollback;
>
> Mike
>
Your subquery is correlated with the outer query. So the c2 in the
subquery is referring to table x.
--
Jack Christensen
jackc(at)hylesanderson(dot)edu