1. A method for materialized query table matching, the method comprising: receiving a database query; retrieving a materialized query table from data storage accessible to a database management system; selecting a join in the materialized query table between a table that is not invoked by the query and a table that is invoked in the query; determining whether the selected join is lossless; and if the selected join is lossless, expanding the query to include the lossless join.