单项选择题
下面哪个函数返回的是满足给定条件的平均值()
A.Max(col_name)
B.Avg(col_name)
C.Sum(col_name)
D.COUNT(col_name)
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单项选择题
A.Max(col_name)
B.Avg(col_name)
C.Sum(col_name)
D.COUNT(col_name)
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