Hi, On Mon, Apr 14, 2008 at 1:54 PM, Jamie Madill <[EMAIL PROTECTED]> wrote: > Hello, > > Basically I want to know if this is a good query for indexing. > > I have the following query: > > select > count(1) as count > from > session > where > last >= DATE_SUB(NOW(), INTERVAL :from SECOND) > > Is it safe to assume that the expression calling the function DATE_SUB > is evaluated just once to a fixed date?
Yes, that's correct. -- Baron Schwartz, Senior Consultant, Percona Inc. Tel: +1 888 401 3401 ext 507 24/7 Emergency Line +1 888 401 3401 ext 911 Our Services: http://www.percona.com/services.html Our Blog: http://www.mysqlperformanceblog.com/ -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
