Return previous value of the group

[Tiaguinho]

Hello,

I own a report with grouping by date, and with a summation by date. I need the sum of the previous date for the calculation of the next date.

But have not found a way to busar the previous value, I tried to create a new variable, but the same always updated with the current value date of the group.

Could anyone help me?

[Sukanya Parisa]

check the running sum concepts in sql, it may helpful

[Tiaguinho]

Yes. I resolve this problem in the sql. The SQL retrieve all data and after calculate value.

thanks for the answer. :)