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问题详情

关系R和S各有5个元组,则关系RxS的元组个数为( )

A、5

B、10

C、25

D、不确定

时间：2021-09-06 21:13 关键词：青书学堂平顶山学院会计学数据库应用技术(专升本)

答案解析

C

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关系R和S各有5个元组,则关系RxS的元组个数为( )