hello,
im to solve for about a week.
i have many tables, each table has 3 columns (z,y,quantity), and a "header".
what im trying to do is:
1.sum quantity when 2 conditions (z,y) are same (in same table).
2.sum all tables, when one table have same header as other, and x,y are same.
VALUES IN X AND Y ARE IN INFINITE. (which mean i cant formulate it to a specific values)
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