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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)
from tt
group by to_char(date,'yyyy-mm')
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select * from tt order by date
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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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