Re: NOT IN query issues

Robert,

Try:

delete from sharinfo where not exists (
select file__no from allforms where sharinfo.file__no =
allforms.file__no);

Make sure allforms is indexed on file__no.

"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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