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下面选项中，可实现比SELECT语句更方便查询用户权限信息的语句是
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1. What has made colleges the most Internet-accessible spots in the world?2. According to one leading university director, why are college students encouraged to use smartphones on campus?3. Why does the author ask us to remember to regulate and balance our time?4. Some colleges increased their budgets for information technology. What did they do with the money?5. Why did one university give every one of its incoming freshmen a free Apple iPad?
两段锁协议规定，当事务释放了一个封锁以后，事务进入解锁阶段，在该阶段只能进行解锁操作不能再进行加锁操作
遵守两段锁协议的事务调度不可能再发生死锁
两段锁协议的方法保证并发调度的可串行性，从而保证调度的正确性
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