How to sum excel data in another worksheet, using the value of a reference cell

Question

I have data in an excel worksheet that is entered daily. I have a column for week number.

In another worksheet I want to have separate rows for each week of data.

I figure I can SUM the daily data into the weekly worksheet using the value in the week number from the first spread sheet.

I can't figure out a simple formula to achieve this? Any attempt to manually enter a SUM formula and drag down, fails as the cells used increases by one rather than 7.

Answer 1

If you have the second table on Sheet2, and the one you posted is on Sheet1:

=SUMIF(Sheet1!$B:$B, Sheet2!$A2, Sheet1!$D:$D)

This formula would go in B2 of Sheet2, if the week numbers are listed in column A, starting in A2.

eg:

        A        B
1    Week No.   SUM
2      23       5795 
3      24       6204