Can Multiple Indexes Work Together?

Question

Suppose I have a database table with two fields, \"foo\" and \"bar\". Neither of them are unique, but each of them are indexed. However, rather than being indexed together, th

Answer 1

The best approach would be to add foo to bar's index, or add bar to foo's index (or both). If foo's index also contains an index on bar, that additional indexing level will not affect the utility of the foo index in any current uses of that index, nor will it appreciably affect the performance of maintaining that index, but it will give the database additional information to work with in optimizing queries such as in the example.