Finally! :)
Richard Huntley <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
06/25/2002 07:48 AM
Please respond to ORACLE-L
To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
cc:
Subject: RE: NOT IN performance problem
Nils, try this...(replaces NOT IN with an Outer Join)
select a.id from person a, phonenumber b
where a.id = b.id(+)
and b.id is null;
-----Original Message-----
Sent: Tuesday, June 25, 2002 9:08 AM
To: Multiple recipients of list ORACLE-L
Hello,
I have encountered a performance problem. I use "Oracle8 Enterprise
Edition
Release 8.0.5.0.0 - Production."
I have two tables. "phonenumber" and "person", each person has none, one
or
many phonenumbers referenced to him.
The phonenumber-table is structured like:
phonenumber.personid
phonenumber.phonenumber
The person-table is structured like:
person.personid
person.name
person.address
I wan't to know which persons that does NOT have any phonenumber(s).
I can write the query as:
SELECT personid FROM phonenumber WHERE personid NOT IN (
SELECT personid FROM person);
However, since my tables are quite large, it takes forever to run my
query.
In the real database both (or
atleast one) of "person" or "phonenumber" are views.
To figure out who _does_ have phonenumbers is SIGNIFICANTLY faster.
(SELECT DISTINCT person.personid FROM person, phonenumber WHERE
person.personid=phonenumber.personid)
I'm wondering how I could restructure or rewrite my query ("who doesn't
have
any phoinenumbers?") to run faster,
or if there is anything else I can do to optimize the query?
Any suggestions?
--
/Nils Höglund, Naqua KB
E-mail: [EMAIL PROTECTED]
Web: http://www.naqua.se/
Home Phone: +46 (0)18 30 09 19
Cellular Phone: +46 (0)736 51 74 58
Address: Nya Valsätrav. 26 B
SE-756 46
Uppsala, Sweden
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