Combining Multiple Excel Sheets in Power Query
You are importing data from an Excel workbook that contains multiple sheets. Each sheet has similar structure but different data for different regions. You need to combine all sheets into a single table for analysis. What should you do?
⚠ Common exam trap
Watch out — candidates often confuse Merge Queries (which combines columns via joins) with Append Queries (which combines rows), leading them to select Option A when the requirement is to stack data from multiple sheets.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
In Power Query Editor, use Append Queries to combine the sheets.
The Append Queries operation in Power Query Editor is designed to combine rows from multiple tables or queries with similar column structures into a single table. Since each sheet in the Excel workbook contains data for different regions with the same structure, appending them stacks the rows, creating a unified dataset for analysis.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
In Power Query Editor, use Merge Queries to combine the sheets.
Why it's wrong here
Merge Queries joins two tables on matching key columns, producing a widened result rather than stacking rows from sheets with identical structure. It tempts because merging is a genuine Power Query transformation, but it is correct when relating tables by key, not appending same-schema sheets.
- ✓
In Power Query Editor, use Append Queries to combine the sheets.
Why this is correct
Append Queries stacks tables with matching columns vertically, combining the identically structured regional sheets into one table. This satisfies the requirement to consolidate all sheets into a single table for analysis without altering the underlying column structure.
- ✗
Copy and paste the data from each sheet into a master sheet in Excel.
Why it's wrong here
Manual copy-and-paste produces a static table that must be redone whenever source sheets change, and it bypasses Power Query's refreshable pipeline entirely. It tempts because it is quick for a one-off snapshot, yet the Append Queries transformation is correct for combining same-structure sheets repeatably.
- ✗
In Power Query Editor, use Group By to consolidate the data.
Why it's wrong here
Group By aggregates rows sharing key values; it cannot append sheets with identical columns. Combining regional sheets requires the Append Queries operation, which stacks them into one table. Group By would be right when summarising transactions per region, such as total sales by product.
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