Q.

The effect of the ROLLBACK command in a transaction is the following _

A. Undo all changes to the data-base resulting from the execution of the transaction
B. Undo the effects of the last UPDATE command
C. Restore the content of the database to its state at the end of the previous day
D. Make sure that all changes to the database are in effect
E. None of these
Answer» A. Undo all changes to the data-base resulting from the execution of the transaction
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