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【单选题】
下面有关数据库触发器作用描述错误的是A.
是一个预编译的SQL语句,优点是允许模块化的设计
B.
是一种特殊的存储过程,主要是通过事件来触发而被执行的
C.
它可以强化约束,来维护数据的完整性和一致性,可以跟踪数据库内的操作从而不允许未经许可的更新和变化
D.
可以联级运算。如,某表上的触发器上包含对另一个表的数据操作,而该操作又会导致该表触发器被触发
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皮皮学刷刷变学霸
举一反三
【单选题】What does the man imply when he tells the woman not to get her hopes up?
A.
The director probably isn't able to make an exception.
B.
The director probably won't see her.
C.
The director usually isn't very helpful.
D.
The director is not responsible for taking care of part-time students.
【单选题】He claimed that it was her rudeness that______him to strike her.
A.
proposed
B.
protected
C.
provided
D.
provoked
【简答题】听对话，回答问题。 1. What is Rose busy with? [ ] A. Her trip plan B. Her school exam C. Her summer program 2. Who will go camping with Rose? [ ] A. Bill B. Her sister C. Her classmate 3. How does Rose...
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