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关系模式R分解成数据库模式ρ的一个优点是()。

单选题
2022-03-16 01:29
A、数据分散存储在多个关系中
B、存储悬挂元组
C、提高查询速度
D、数据容易恢复
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正确答案
B

试题解析

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