execute
Executes the query returning a result set that enumerates result rows one at a time. You can run the query any number of times, and you can even have multiple ResultSet active at once.
The results come from a snapshot of the database taken at the moment the run() method is called, so they will not reflect any changes made to the database afterwards.
Return
the ResultSet for the query result.
Throws
if there is an error when running the query.