ROLLBACK WORK asks SQL to empty the log file.

The UNION clause is used to combine the output from multiple queries together into a single result table.

When AUTOCOMMIT is set on, changes will be made automatically at the end of each SQL statement.

A transaction is the complete set of closely related update commands that must all be done, or none of them done, for the database to remain valid.

The code to create triggers and routines is stored in only one location and is administered centrally.