| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | dakotali kasap <dakotalidavid(at)yahoo(dot)com> |
| Cc: | Neil Conway <neilc(at)samurai(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Want to use my own query-plan |
| Date: | 2006-10-21 21:36:34 |
| Message-ID: | 20061021213634.GB27685@alvh.no-ip.org |
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| Thread: | |
| Lists: | pgsql-hackers |
dakotali kasap wrote:
> Therefore, I want to say the join-method that
> will be used or which relation will be outer which one will be inner.
> (I cannot do this just using SELECT * FROM a JOIN b).
You can't force the system to use a particular join method, but you can
select which one is inner and which one is outer -- you just need to set
join_collapse_limit to 1, and write the query in the specific order you
want. See
http://momjian.us/main/writings/pgsql/sgml/runtime-config-query.html#RUNTIME-CONFIG-QUERY-OTHER
and
http://momjian.us/main/writings/pgsql/sgml/explicit-joins.html
(sorry, pointers to development-version docs).
--
Alvaro Herrera http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.
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