syntax: TRUNCATE TABLE table_name
TRUNCATE TABLE differs from DELETE FROM … in the following ways:
* Truncate operations drop and re-create the table, which is much faster than deleting rows one by one.
* Not transaction-safe; you will get an error if you have an active transaction or an active table lock.
* Doesn't return the number of deleted rows.
* As long as the table definition file `table_name.frm' is valid, the table can be re-created this way, even if the data or index files have become corrupted.
TRUNCATE is an Oracle SQL extension.