SQL 语句可使用____________返回唯一不同的值
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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