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如果要在数据库的两张表之间建立永久关系,则至少要求在父表的结构复合索引文件中创建一个()在子表的结构复合索引文件中创建任何类型的文件。

单选题
2022-01-01 02:48
A、主索引
B、候选索引
C、主索引或候选索引
D、唯一索引
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正确答案
C

试题解析

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如果要在数据库的两张表之间建立永久关系,则至少要求在父表的结构复合索引文件中创建一个(),在子表的结构复合索引文件中创建任何类型的文件。
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