Say I have this schema CREATE TABLE temp ( EntityId BIGINT AUTO_INCREMENT PRIMARY KEY, CreationTime DEFAULT NOW() );
Now let's say I want to find all rows created within the last 24 hours. If I do select * from temp where CreationTime > DATE_SUB(NOW(), INTERVAL 24 HOUR) that's going to do a full table scan to find out, even though there's already an implicit ordering in EntityId (this is of course assuming I don't manually set CreationTime to something else). Is there any way to take advantage of the fact that there's a primary key index on entityId, or do I have to put a secondary index on CreationTime? Thanks, Waynn -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
