Thanks.
That's part of the solution I've adopted. The issue is I want the answers for 3mos, 6mos, and 12mos on the same query from the same source table.
I used a solution similar to that posted three times, one for each total, by adding the source table 3 times (source_1, source_2, source_3)...
I have a large number of records that detail selling by item and location and week.
How can I query the table to get the total sales over the last 3mos, 6mos, and 12mos?
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