David G Johnston wrote:
> I personally find the use of "," in the FROM-clause to be poor form and its
> even worse if you decide to mix both "," and explicit JOIN clauses. If you
> want to make this be explained better feel free to provide suggestions; but
> I'd suggest you simply forget the fact that "FROM A, B" is even valid and
> just use the proper joining keywords instead.
Note that using explicit join form force the optimizer into some
specific join order, depending on the join_collapse_limit parameter,
whereas using commas gives it absolute freedom regardless of the
parameter.
--
Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
