> Next question. If you have the two separate indexes and then do two > queries, one for a and one for b. If you then get a list of unique id's > of both, would it be faster to create an intersection yourself rather > than have the server do the legwork?
If you only have 2 unrelated indexes on a & b, it depends on the data, the distribution of values, etc. No single answer here, test with your data and you'll have the results. If you need it often, I'd go for the combined index & let MySQL do the work, which is probably fastest. -- Rik Wasmus -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=arch...@jab.org
