MySQL Forums
Forum List  »  Performance

Re: MySQL rand() is slow on large datasets
Posted by: Mike Pogues
Date: May 12, 2009 10:21AM

Tried Jeff's query but only low number ids were generated. The query below solves this.

SELECT t.id FROM table t JOIN (SELECT(FLOOR(max(id) * rand())) as maxid FROM table) as tt on t.id >= tt.maxid LIMIT 1

Options: ReplyQuote


Subject
Views
Written By
Posted
18004
July 24, 2007 08:19AM
7270
September 02, 2007 10:30AM
Re: MySQL rand() is slow on large datasets
7187
May 12, 2009 10:21AM


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.