I have two tables that are related: Parent LONG id LONG childCount LONG maxChildAge ...
Child LONG parentId LONG age ... There can be thousands of parents and millions of children, that is why I have denormalized "childCount" and "maxChildAge". The values are too expensive to calculate each time the data is viewed so I update these values each time a Child is added, removed, or modified. I currently have to update the Parent table with two queries like so: SELECT MAX( Child.age ), COUNT(*) FROM Child WHERE parentID = <x>; UPDATE Parent SET maxChildAge = MAX, childCount = COUNT WHERE id = <x>; Worse yet I might be updating the stats for several hundred Parents at a time, so I have to loop through the above where <x> is the current Parent.id in the batch. What I would like to do is something like the following (made up syntax): UPDATE Parent SET maxChildAge AND childCount = COUNT WITH ( SELECT MAX( Child.age ), COUNT(*) FROM Child WHERE parentID = Parent.id ) WHERE id IN ( <set_of_parents_to_update> ); Any suggestions? TIA R. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]