简单统计sql

select A.YY,        sum(decode(A.mm, '01', A.NUM, 0)) as 一月,        sum(decode(A.mm, '02', A.NUM, 0)) as 二月,        sum(decode(A.mm, '03', A.NUM, 0)) as 三月,        sum(decode(A.mm, '04', A.NUM, 0)) as

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