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在一个关系R中,若存在X→Y和X→Z,则存在X→(Y,Z),称此为函数依赖的()规则。
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在一个关系R中,若存在X→Y和X→Z,则存在X→(Y,Z),称此为函数依赖的()规则。
A、传递性
B、分解性
C、合并性
D、增广性
时间:2022-01-02 03:04
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国家开放大学(数据库基础与应用)
CMS专题
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计算机信息管理
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C
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