题目内容

SQL 语句可使用____________返回唯一不同的值

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___________是目前最常用的数据模型

文凭

A. discover
B. diploma
C. disappear
D. direct
E. disaster
F. disappointed
G. dirty
H. discount

直接

A. discover
B. diploma
C. disappear
D. direct
E. disaster
F. disappointed
G. dirty
H. discount

肮脏的

A. discover
B. diploma
C. disappear
D. direct
E. disaster
F. disappointed
G. dirty
H. discount

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