Handle a Bad Power Query Merge Without Guessing
Diagnose a Power Query merge that creates missing matches or duplicate rows.
Decision point A supplier cost query jumps from 42,000 to 47,800 rows after refresh. The merge step did not error; it multiplied rows. A clean-looking Excel result can still answer the wrong question. 5 Whys root-cause analysis Choose by context, then verify A supplier cost query jumps from 42,000 to 47,800 rows after refresh. The merge step did not error; it multiplied rows. The framework is 5 Whys root-cause analysis. In this lesson, it grounds Power Query merge diagnosis. The point is not to use an advanced Excel feature because it exists; it is to make the workbook more reliable…
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