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单选,5分] 关系模式的候选关键字可以有1个或多个,而主关键字有( ) 。
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单选,5分] 关系模式的候选关键字可以有1个或多个,而主关键字有( ) 。
A、多个
B、0个
C、1个
D、1个或多个
时间:2021-09-03 16:25
关键词:
联大
河南财经政法大学
工商管理
数据库应用
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C@#@C
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