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ROLLBACK -- abort the current transaction
ROLLBACK [ WORK | TRANSACTION ]
ROLLBACK rolls back the current
transaction and causes all the updates made by the transaction to
Optional key words. They have no effect.
Use COMMIT to successfully
terminate a transaction.
Issuing ROLLBACK when not inside a
transaction does no harm, but it will provoke a warning
To abort all changes:
The SQL standard only specifies the two forms ROLLBACK and ROLLBACK WORK.
Otherwise, this command is fully conforming.