Re: Query with GROUP BY not using Index
Posted by:
Rick James
Date: August 18, 2012 10:30PM
Can you use VARCHAR(255) instead of (256)? That would eliminate the need for "prefixing".
You really need
INDEX(wafer_name, date)
It does not make sense to GROUP BY one set of things, then ORDER BY something that is not in the GROUP BY list! Which `date` would be used for a given wafer_name??
Subject
Views
Written By
Posted
2747
August 14, 2012 01:06PM
1327
August 15, 2012 02:46AM
1253
August 16, 2012 10:30AM
1523
August 17, 2012 02:58AM
Re: Query with GROUP BY not using Index
1270
August 18, 2012 10:30PM
1204
August 24, 2012 12:41PM
1284
August 28, 2012 03:11AM
1337
August 28, 2012 06:21PM
1694
August 29, 2012 01:28AM
1174
August 29, 2012 10:36AM
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.