get sum value for each date (date loop)
empno due_date val
1 1-1-2021 100
1 1-1-2021 35
1 2-1-2021 100
1 3-1-2021 200
1 4-1-2021 300
1 5-1-2021 100
1 6-1-2021 100
2 1-1-2021 100
output
empno 1-1-2021 1-1-2021 1-1-2021 1-1-2021 1-1-2021 1-1-2021
1 135 100 200 300 100 100
2 100 0 0 0 0 0