4、事务一致性是指事务执行前后数据库中的数据保持不变。()
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5、GRANT INSERT ON TABLE S TO U1 是给用户U1赋予在S表中插入数据的权限。()
A. 对
B. 错
6、触发器是对数据库的完整性的控制。()
A. 对
B. 错
The Internet allows rural school children ________about what is happening in the world.
A. to learn
B. learning
C. learn
The Olympic Games is a very important ______ for the athletes.
A. accident
B. incident
C. event