Yeah, I have those days.
The beach sounds good; don't worry, I'll go find my own.
Wouldn't want to frighten the natives.
Try 'not exists', 'not in' forces a table scan.
Even better, use an explicit anti-join.
select a.f1, a.f2, a.f3, a.f4
from table1 a, table2 b
where a.f1 = b.n1(+)
and b.n1 is null;
I learned this from Larry Elkins, I *think* I did it properly.
Rather clever I thought.
Jared
"Johnson, Michael " <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
05/17/2002 02:23 PM
Please respond to ORACLE-L
To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
cc:
Subject: Do you ever have days where you dont want to think ?
I just just wanna go lie on a beach naked
on some remote island far far away and not
think of anything for a month.
Here is the issue.....
I have a query that looks like this ...
select a.f1, a.f2, a.f3, a.f4 from table1 a
where a.f1 not in
( select b.n1 from b );
there is a primary key index on b.n1
there is a concatenated primary key index on a.f1,a.f2,a.f3
there is a non-unique index on a.f1
the query shows that the index is being used
on table b, but no indexes are being used on table a.
Mike
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Johnson, Michael
INET: [EMAIL PROTECTED]
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
San Diego, California -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from). You may
also send the HELP command for other information (like subscribing).
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author:
INET: [EMAIL PROTECTED]
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
San Diego, California -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from). You may
also send the HELP command for other information (like subscribing).
