| From: | Stephan Szabo <sszabo(at)megazone23(dot)bigpanda(dot)com> |
|---|---|
| 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 18:18:49 |
| Message-ID: | Pine.BSF.4.21.0106181110080.85469-100000@megazone23.bigpanda.com |
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| Thread: | |
| Lists: | pgsql-hackers pgsql-sql |
I think that using INNER JOIN between nl and n (on n.nid=nl.nid) or
joining those tables in a subquery might work.
On Mon, 18 Jun 2001, The Hermit Hacker wrote:
> Is there some way to write the above so that it evaluates:
>
> WHERE (n.type = 'A' OR n.type = 'N' OR n.type = 'H' OR n.type = 'C')
> AND (nl.id = 15748 AND contact_lvl = 'company')
> AND n.nid = nl.nid
>
> first, so that it only has to do the LEFT JOIN on the *one* n.nid that is
> returned, instead of the 86736 that are in the table?
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