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【071题库】最新OCP-071考试题库解析-第42题

【071题库】最新OCP-071考试题库解析-第42题

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071题库-第42题、choose three

Which three tasks can be performed by DDL statements?

A) preventing data retrieval from a table outside of office hours

B) modifying a table to prevent data that violate certain conditions from being entered in a column

C) preventing any data modification to a table

D) creating multiple savepoints to enable partial rollback of a transaction

E) providing an alternative name for a table

Anser:BCE

(解析:B 答案可以用添加约束来解决;C 答案可以用 alter 命令把表变成只读模式;E 答案可以通过创建同义词来实现,这道题比较灵活,表达的比较隐晦。)

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