This is enabled by default in version 9.2.0.5 and up. Are you explicitly disabling it in your environment? Pat ________________________________ From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Rob Dempsey Sent: Wednesday, April 23, 2008 12:08 PM To: oracle-l@xxxxxxxxxxxxx Subject: HASH GROUP BY Hi Our current Oracle version -> 10.2.0.1 Does anyone know what version this feature has been fixed in. I would like to enable the feature, but it seems to have been very buggy (especially with wrong results) Rob [CONFIDENTIALITY AND PRIVACY NOTICE] Information transmitted by this email is proprietary to Medtronic and is intended for use only by the individual or entity to which it is addressed, and may contain information that is private, privileged, confidential or exempt from disclosure under applicable law. If you are not the intended recipient or it appears that this mail has been forwarded to you without proper authority, you are notified that any use or dissemination of this information in any manner is strictly prohibited. In such cases, please delete this mail from your records. To view this notice in other languages you can either select the following link or manually copy and paste the link into the address bar of a web browser: http://emaildisclaimer.medtronic.com