Power Query Merge
Join two tables by one or more keys with repeatable refresh steps.
What this solves
Merge supplier master data into a PO extract. This pattern is useful when the business question is clear but a generic tutorial is too abstract.
The rule
Choose the join columns carefully and verify match counts after the merge.
Home → Merge Queries → choose matching key columnsGoogle Sheets: The core pattern is also usable in Google Sheets; exact function support and locale separators can differ.
Real-work checklist
- Define the business key and expected grain before writing the formula, query or markup.
- Test the pattern on a small known sample where you can verify the answer manually.
- Check missing values, duplicates and data types before trusting a large result.
- Scale to the real file or database only after the logic is proven.
Common mistake
Duplicate keys on either side can multiply rows after the merge.