Pivot Data Tool — illustrative example

INPUT
Pivot month into columns. Each product/month pair is unique. CSV input:
product,month,value
A,Jan,10
A,Feb,12

RESULT
product,Jan,Feb
A,10,12

Check: both input observations remain represented; combined value stays 22. No aggregation was necessary.

REVIEW
Pivoting needs a rule for repeated combinations. Do not discard duplicate values when the intended aggregation has not been specified.

This is a teaching example, not a live execution record.