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8.8 Judge equality of sets when order is ignored
Here below is a monthly sales ranking table for the first quarter:
Find out the month that contains the top 3 products by total sales in the first quarter:
| A | |
|---|---|
| 1 | =E(‘A1:D10’) |
| 2 | =A1.groups(ProductName;sum(Sales):Sales).sort(Sales:-1).(ProductName)(to(3)) |
| 3 | return A1.group@o(Month).select(~.(ProductName).pos(A2)!=null).id(Month) |
A1: Convert the passed-in data to a two-dimensional table sequence.
A2: Calculate the top 3 products by total sales in the first quarter.
A3: When the number of set members is the same, using the pos function can judge the equality of sets in the case that the order is ignored.
Result: Mar
