Which constraint can be defined only at the column level? （） -题库考试答案搜索网

Which constraint can be defined only at the column level? （）

单选题

2022-07-11 09:08

A、UNIQUE
B、NOT NULL
C、CHECK
D、PRIMARY KEY
E、FOREIGN KEY

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正确答案

B

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标签： 1Z0-007

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