Re: LEFT JOIN ...
От | The Hermit Hacker |
---|---|
Тема | Re: LEFT JOIN ... |
Дата | |
Msg-id | Pine.BSF.4.33.0106181716360.22744-100000@mobile.hub.org обсуждение исходный текст |
Ответ на | Re: LEFT JOIN ... (Tom Lane <tgl@sss.pgh.pa.us>) |
Список | pgsql-sql |
Perfect, thank you ... i knew I was overlooking something obvious ... the query just flies now ... On Mon, 18 Jun 2001, Tom Lane wrote: > The Hermit Hacker <scrappy@hub.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 > Marc G. Fournier ICQ#7615664 IRC Nick: Scrappy Systems Administrator @ hub.org primary: scrappy@hub.org secondary: scrappy@{freebsd|postgresql}.org
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