From: Michael Glaesemann <grzm@myrealbox.com>
To: Larry Rosenman <ler@lerctr.org>
Cc: pgsql-sql@postgresql.org
Subject: Re: Query issue/8.0.1/Serendipity
Date: Tue, 8 Mar 2005 21:21:08 +0900
Message-ID: <a5c61556de7ac42a8e84e857dcff3988@myrealbox.com> (raw)
In-Reply-To: <200503080548.17179.ler@lerctr.org>
References: <200503080548.17179.ler@lerctr.org>
Larry,
Restating your SQL in a more reader-friendly form:
SELECT timestamp
FROM serendipity_entries e
, serendipity_category c
, serendipity_entrycat ec
LEFT OUTER JOIN serendipity_entryproperties ep_cache_extended
ON (e.id = ep_cache_extended.entryid
AND ep_cache_extended.property = 'ep_cache_extended')
LEFT OUTER JOIN serendipity_entryproperties ep_cache_body
ON (e.id = ep_cache_body.entryid
AND ep_cache_body.property = 'ep_cache_body')
LEFT OUTER JOIN serendipity_entryproperties ep_access
ON (e.id = ep_access.entryid
AND ep_access.property = 'ep_access')
LEFT JOIN serendipity_entryproperties ep_sticky
ON (e.id = ep_sticky.entryid
AND ep_sticky.property = 'ep_is_sticky')
WHERE e.timestamp >= 1109656800
AND e.timestamp <= 1112335200
AND e.timestamp <= 1110241185
AND e.isdraft = 'false'
AND ( ep_access.property IS NULL
OR ep_access.value = 'member'
OR ep_access.value = 'public'
OR (ep_access.value = 'private'
AND e.authorid = 1)
)
AND e.id = ec.entryid
AND c.categoryid = ec.categoryid
AND c.category_left BETWEEN 3 AND 4
I can see you're using a lot of left joins. You are beginning your left
joins off of ec, so I believe neither e nor c can be referenced as join
conditions. It might work if you reorder the first part of the FROM
clause as the following:
FROM serendipity_category c
, serendipity_entrycat ec
, serendipity_entries e
LEFT OUTER JOIN serendipity_entryproperties ep_cache_extended
(Though I can't be sure without seeing table definitions.)
It also appears you have a redundant e.timestamp constraint in the
WHERE clause: if e.timestamp is >= 1110241185 it's definitely going to
be <= 1112335200
Hope this helps. I find white space helps me read my own SQL much more
easily.
Michael Glaesemann
grzm myrealbox com
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To: pgsql-sql@postgresql.org
Cc: grzm@myrealbox.com, ler@lerctr.org
Subject: Re: Query issue/8.0.1/Serendipity
In-Reply-To: <a5c61556de7ac42a8e84e857dcff3988@myrealbox.com>
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