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