79、Which statement is true about transactions?
A. A set of Data Manipulation Language (DML) statements executed in a sequence ending with a SAVEPOINT forms a single transaction.
B. Each Data Definition Language(DDL) statement executed forms a single transaction.
C. A set of DDL statements executed in a sequence ending with a COMMIT forms a single transaction.
D. A combination of DDL and DML statements executed in a sequence ending with a COMMIT forms a single transaction.
Correct Answer: B
Section: (none) Explanation：每个DDL语句都是一个事务，因为DDL语句执行后自动提交。如果A答案SAVEPOINT改为COMMIT或者ROLLBACK那么就是正确的。