Re: NOT IN query issues

Might not help but try exists.

Have seen cases where the not in just doesn't seem as optimized

HTH

Darren Ferguson

On Tue, 7 May 2002, Booth, Robert wrote:

> I'm trying to run a DELETE query using NOT IN and it's causing me some
> problems.
>
> Here is the query that I want to run:
>
>     delete from sharinfo where file__no not in (select file__no from
> allforms);
>
> When I explain this I get:
>
>     Seq Scan on sharinfo  (cost=0.00..2225204.88 rows=5239 width=6)
>       SubPlan
>         ->  Seq Scan on allforms  (cost=0.00..424.69 rows=8669 width=12)
>
> Which while a very large number does seem to work.  But when I run the query
> nothing appears to happen, I've left this query running for hours with no
> response back.  Is there a better way to run a query like this (deleting all
> rows that don't appear in a second table)?
>
> Thanks,
> Rob
>
>
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