外部码是什么意思-外部码的词语解释-相关组词-词语-近音词-同音词 - 掌上跨屏通词语词典

题目

更新时间：2025-02-08 19:13:56

求解答，词语外部码是什么意思？再说说外部码有什么含义？

答案

外部码的百科含义

关系模式R中属性或属性组X并非R的候选码，但X是另一个关系模式的候选码，且X与R的主码对应，则称X是R的外部码（Foreign Key），也称外码

外部码的词语组词

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外部码的相关词语

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