MySQL Forums
Forum List  »  Optimizer & Parser

Advanced Search
New Topic

Re: Performance impact of filtering in ON vs WHERE clause
Posted by: Apachez
Date: April 28, 2006 12:26PM

The proper use is to only have which columns are equal in the ON part and filtering in the WHERE part.

Any logic for the join will make it to slow down.

So in your case 2) will always be slower than 1).

Navigate: Previous Message• Next Message
Options: Reply• Quote


Subject
Views
Written By
Posted
Performance impact of filtering in ON vs WHERE clause
15246
John McNally
April 28, 2006 12:17PM
Re: Performance impact of filtering in ON vs WHERE clause
5406
Apachez
April 28, 2006 12:26PM
Re: Performance impact of filtering in ON vs WHERE clause
4420
Sebastien Caisse
May 01, 2006 08:40AM
Re: Performance impact of filtering in ON vs WHERE clause
4432
Apachez
May 01, 2006 12:54PM
Re: Performance impact of filtering in ON vs WHERE clause
4553
Sebastien Caisse
May 02, 2006 01:06PM
Re: Performance impact of filtering in ON vs WHERE clause
4487
Apachez
May 02, 2006 01:15PM
Re: Performance impact of filtering in ON vs WHERE clause
5313
Björn Steinbrink
May 02, 2006 02:21PM


Sorry, you can't reply to this topic. It has been closed.

Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represent the opinion of Oracle or any other party.