Re: Non Matching Records in Two Tables

On Tue, 2006-02-14 at 13:24 -0800, Ken Hill wrote:

> On Tue, 2006-02-14 at 13:08 -0800, chester c young wrote:
>
> > > Here is my query SQL:
> > >
> > > SELECT key100 FROM ncccr10
> > > WHERE ncccr10.key100 NOT IN (SELECT key100 FROM ncccr9);
> > >
> > > It is is running after 30 minutes. Here is the query plan:
> > >
> >
> > I would try an outer join:
> >
> > select a.key100
> > from ncccr10 a
> > left join ncccr9 b on( key100 )
> > where b.key100 is null;
> >
> > also (hate to be obvious) have you analyzed lately?
> >
> >
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> Yes, I did a VACUUM ANALYZE on the entire database before running this
> query. Also, I get an error with your suggestion:
>
> csalgorithm=# SELECT a.key100 FROM ncccr10 a
> csalgorithm-# LEFT JOIN ncccr9 b ON(a.key100)
> csalgorithm-# WHERE b.key100 IS Null;
> ERROR: argument of JOIN/ON must be type boolean, not type character
>

Well, this works:

SELECT *
FROM ncccr9 a
LEFT JOIN ncccr10 b USING( key100 )
WHERE b.key100 is null;

It still seems slow. It takes about the same time to run as in MS
Access. I thought PostgreSQL would be faster.