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colmkav  
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 More options Jul 4 2007, 10:27 am
Newsgroups: comp.databases.oracle.misc
From: colmkav <colmj...@yahoo.co.uk>
Date: Wed, 04 Jul 2007 07:27:48 -0700
Local: Wed, Jul 4 2007 10:27 am
Subject: Re: NOT IN
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On 4 Jul, 15:26, Charles Hooper <hooperc2...@yahoo.com> wrote:

> On Jul 4, 8:47 am, colmkav <colmj...@yahoo.co.uk> wrote:

> > is it possible to write an SQL Oracle query where you want to check
> > whether a combination of fields exist in another query

> > eg I tried the following but got an error:

> > select count(*) from tmp_risk_sum where book, strategy, exposuretypeid
> > not in (select book, strategy, exposuretypeid from tmp_risk_sum_ORACLE)

> SELECT
>   COUNT(*)
> FROM
>   TMP_RISK_SUM
> WHERE
>   (BOOK,STRATEGY,EXPOSURETYPEID) NOT IN (
>     SELECT
>       BOOK,
>       STRATEGY,
>       EXPOSURETYPEID
>     FROM
>       TMP_RISK_SUM_ORACLE);

> You may find that this syntax executes more efficiently:
> SELECT
>   COUNT(*)
> FROM
>   TMP_RISK_SUM S,
>   (SELECT DISTINCT
>     BOOK,
>     STRATEGY,
>     EXPOSURETYPEID
>   FROM
>     TMP_RISK_SUM_ORACLE) SO
> WHERE
>   S.BOOK=SO.BOOK(+)
>   AND S.STRATEGY=SO.STRATEGY(+)
>   AND S.EXPOSURETYPEID=SO.EXPOSURETYPEID(+)
>   AND SO.BOOK IS NULL;

> Charles Hooper
> IT Manager/Oracle DBA
> K&M Machine-Fabricating, Inc.

Why does this work? Surely you would need a similar SO.STRATEGY IS
NULL a nd EXPOSURETYPEID IS NULL

Also why does this execute better


 
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