如果指定参照完整性的删除规则为“级联”,则当删除父表中的记录时( )。 -题库考试答案搜索网

如果指定参照完整性的删除规则为“级联”,则当删除父表中的记录时( )。

单选题

2021-07-17 23:46

A、系统自动备份父表中被删除记录到一个新表中
B、若子表中有相关记录,则禁止删除父表中记录
C、会自动删除子表中所有相关记录
D、不作参照完整性检查,删除父表中的记录与子表无关

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正确答案

C

试题解析

标签：能源与动力工程专升本 VB程序设计期末考试

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