判断题
正确(↓↓↓ 点击‘点击查看答案’看答案解析 ↓↓↓)
A.uq_userid;外键B.userid;唯一C.uq_userid;检查D.userid;主键
A.deletefromstudentB.droptablestudentC.deleteall*fromstudentD.dropallfromstudent
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