To be complete, this same error occurs for all the Statistics panels ... -----Original Message----- From: BOUSQUET Jeremie Sent: lundi 18 février 2008 15:50 To: 'XWiki Users' Subject: RE: [xwiki-users] MySQL Error "invalid use of group function" in Statistics application Hi Marius and thanks, Your SQL request returns the same error "invalid use of group function" in my mysql version ... BTW I could have it work by explicitly naming the sum, and using it in the order by : select xws_name, sum(xws_page_views) as pageviewcount from xwikistatsdoc where xws_action='view' and xws_name like '%.%' group by xws_name order by pageviewscount desc I believe it's a difference in behaviour between MySQL 1.4 and 1.5 ... Do you want me to create a JIRA issue for this ? Best Regards, Jeremie -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Marius Dumitru Florea Sent: lundi 18 février 2008 15:19 To: [email protected] Subject: Re: [xwiki-users] MySQL Error "invalid use of group function" in Statistics application Hi Jeremie, Sorry for the inconvenience. Your tables' description seems fine. I attached the description of my tables so you can check it for yourself. I think it all resumes to the following SQL query: select xws_name, sum(xws_page_views) from xwikistatsdoc where xws_action='view' and xws_name like '%.%' group by xws_name order by sum(xws_page_views) desc This query is very similar to the one used for retrieving the Most Viewed Pages. It works fine under: mysql Ver 14.12 Distrib 5.0.45, for pc-linux-gnu (x86_64) using readline 5.2 It would be great if you could run this query and tell me if it works in your case. Best Regards, Marius.