Basically it says that if you have an index let's say INDEX_1 on columns:
INDEX_1 : a, b, c, d MySQL will act as if you had setup indexes on: INDEX_1_1 : a, b, c INDEX_1_2 : a, b INDEX_1_1 : a A query like: SELECT a FROM table_name WHERE a > 9; - will use the index SELECT a, b, c FROM table_name WHERE d > 9; - will use the index Hope this clears up things ! -- Gabriel PREDA Senior Web Developer -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
