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表间参照完整性有( )
A、插入
B、更新
C、删除
D、级联
时间:2021-09-08 16:06
关键词:
青书学堂
平顶山学院
数据库原理(专升本)
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A@#@B@#@C
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boost的意思是:help or encourage to increase or improve
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A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
数据完整性有3种类型:实体完整性、参照完整性、更新完整性。
表间参照完整性有( )
最新问题
参照完整性要求有关联的两个或两个以上表之间数据的一致性。参照完整性可以通过建立()来实现。
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Shutdown price(or point,or rule) 停业价格(或停业点、停业原则)
翻译:With Average or With Particular Average(WA or WPA)()
万方数据库使用布尔逻辑算符anD./or/not.其中A.anD.B表示()。
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