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The ROLLBACK command rolls back the current transaction and causes all updates made by the transaction to be discarded. ::
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ROLLBACK [WORK] TO [SAVEPOINT] identifier
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Calling ROLLBACK causes the updates that were started to be discarded if no identifier is specified; otherwise, it rolls back to the identifier.
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ROLLBACK [WORK] TO [SAVEPOINT] identifier
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Calling ROLLBACK causes the current transaction to undo the transaction that
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has begun if no identifier is specified, otherwise it rolls back to the