Re: Subqueries in select clause - Mailing list pgsql-sql

"Josh Berkus" <josh@agliodbs.com> writes:
> Until you can upgrade, though, try this approach:

> CREATE VIEW c_aggregate AS
> SELECT sum(a) as sum_a, b FROM c GROUP BY b;

> SELECT max(sum_a) FROM c_aggregate;

Unfortunately that won't work in 7.0 --- grouped views have a lot of
problems in that version, and one of the problems is that you can't
do another level of aggregating on their results.

Basically a view and a subselect are the same thing, so you can't get
around the restrictions of one by using the other...

7.1 is what Sara needs.
        regards, tom lane