| From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
|---|---|
| To: | David G Johnston <david(dot)g(dot)johnston(at)gmail(dot)com> |
| Cc: | pgsql-bugs(at)postgresql(dot)org |
| Subject: | Re: BUG #12000: "CROSS JOIN" not equivalent to "," |
| Date: | 2014-11-18 17:52:43 |
| Message-ID: | 20141118175243.GD1948@alvin.alvh.no-ip.org |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-bugs |
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
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Tom Lane | 2014-11-18 17:55:51 | Re: BUG #12000: "CROSS JOIN" not equivalent to "," |
| Previous Message | David G Johnston | 2014-11-18 17:49:54 | Re: BUG #12000: "CROSS JOIN" not equivalent to "," |