Re: Sv: how to build this query ??? Please help !!! - Mailing list pgsql-sql

On Thu, 4 Jan 2001, Jens Hartwig wrote:

> > SELECT a_nr,
> > (SELECT count(*) FROM cylinders WHERE z_a_nr = a_nr) AS #cylinder,
> > [...]
> > FROM orders
>
> Is this a documented feature? Where can I find more information about
> this?  I do not want to join the actual discussion about documentation
> of PostgreSQL but I never before have seen such a construct in SQL!

Subqueries are covered in Bruce Momjian's book:
http://www.postgresql.org/docs/aw_pgsql_book/node93.html

I don't think the PostgreSQL User's Manual mentions sub-selects.
-- 
Tod McQuillin