| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | The Hermit Hacker <scrappy(at)hub(dot)org> |
| Cc: | pgsql-sql(at)postgresql(dot)org, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: LEFT JOIN ... |
| Date: | 2001-06-18 19:56:15 |
| Message-ID: | 8035.992894175@sss.pgh.pa.us |
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| Lists: | pgsql-hackers pgsql-sql |
The Hermit Hacker <scrappy(at)hub(dot)org> writes:
>> Try adding ... AND n.nid = 15748 ... to the WHERE.
> n.nid is the note id ... nl.id is the contact id ...
Ooops, I misread "n.nid = nl.nid" as "n.nid = nl.id". Sorry for the
bogus advice.
Try rephrasing as
FROM (note_links nl JOIN notes n ON (n.nid = nl.nid))
LEFT JOIN calendar c ON (n.nid = c.nid)
WHERE ...
The way you were writing it forced the LEFT JOIN to be done first,
whereas what you want is for the note_links-to-notes join to be done
first. See
http://www.ca.postgresql.org/users-lounge/docs/7.1/postgres/explicit-joins.html
regards, tom lane
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