Thanks for the suggestions over the weekend! I will be looking in to this in a few days - for now I think I am just going to have to re-write my PHP script to make 2 separate queries and array_merge() them - which invariably seems to solve "OR" problems. But there should be a better way, no?
-Dave -----Original Message----- From: David Turner [mailto:[EMAIL PROTECTED] Sent: October 1, 2004 4:04 PM To: [EMAIL PROTECTED] Subject: Indexing for OR clauses Wondering if anyone can give me advice on indexing for OR clauses. I have a table with a number of fields, two of which are sender_id and receiver_id. I also have a query such as this: SELECT ... WHERE (sender_id = 98765 OR reciever_id = 98765) The query is OK for a limit of 10, but if I increase that to 25, it becomes inordinately slower (it is a large table). Is it better for me to have two separate indexes, one for each of sender_id and receiver_id, or one index with both sender_id and receiver_id? Or should I just avoid the use of OR? Or am I simply missing something? -Dave -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED] -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
