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      date              unit      num

      2009-1-1      µ¥Î»1        32

      2009-1-1      µ¥Î»2          22

      2009-1-2      µ¥Î»1          43

      2009-1-2      µ¥Î»2          65 

      2009-2-1      µ¥Î»1          23

      2009-2-1      µ¥Î»2        34



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select to_char(date,'yyyy-mm'),sum(num)
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select to_char(date,'yyyymm') year_month,unit,sum(num) from yourtable
group by to_char(date,'yyyymm'),unit




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