sql - Sum column in last row -


i need sum of column value in column total grouped year, month , day, sum must in "last" row of group

year  month   day   value  total  2017    5     10     10      0 2017    5     21     5       0 2017    5     28     3       18 2017    6     15     8       8 2017    7     14     9       0 2017    7     18     2       11

how can ?

you seem want total on last record each month. can using ansi standard window functions:

select t.*,        (case when row_number() on (partition year, month order day desc) = 1              sum(value) on (partition year, month)              else 0         end) total t;

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