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【单选题】
对于表A(col1 int,col2 char(1))使用聚合函数sum，下面语句正确的是（ ）A.
select sum(col2) as col2 from A group by col1
B.
select sum(col1) as col1 from A group by col2
C.
select sum(col1) as col1,col2 from A group by col1
D.
select sum(col2) as col1 from A group by col2
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