| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Alessandro Gagliardi <alessandro(at)path(dot)com> |
| Cc: | Bartosz Dmytrak <bdmytrak(at)eranet(dot)pl>, Piyush Lenka <lenka(dot)piyush(at)gmail(dot)com>, pgsql-novice(at)postgresql(dot)org |
| Subject: | Re: Postgres restore help |
| Date: | 2012-02-28 21:49:51 |
| Message-ID: | 26955.1330465791@sss.pgh.pa.us |
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| Lists: | pgsql-novice |
Alessandro Gagliardi <alessandro(at)path(dot)com> writes:
> Argh! I can't believe I forgot the "LEFT". That's embarrassing. Anyway, I
> was wondering if a WHERE NOT EXISTS clause would be better. I'm still new
> to those, so didn't want to try to offer that as a solution, but I gather
> it can be more efficient than a JOIN in some cases.
Given a reasonably recent PG version, it should be exactly the same ---
the planner will translate both of those into anti-joins.
regards, tom lane
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