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You tried to pivot a column in Power Query but got an error saying "Aggregation function required". What is the most likely cause?

medium📝 Formula Fix Q14 of 15
Power BI - Data Cleaning with Power Query
You tried to pivot a column in Power Query but got an error saying "Aggregation function required". What is the most likely cause?
AYou selected multiple value columns instead of one
BYou applied pivot on an empty table
CYou did not select an aggregation function for pivoting
DYou tried to pivot a numeric column instead of text
Step-by-Step Solution
Solution:
  1. Step 1: Understand pivot error message

    The error "Aggregation function required" means Power Query needs to know how to combine multiple values when pivoting.
  2. Step 2: Identify missing step

    You must choose an aggregation like Sum or Count when pivoting if multiple rows map to the same pivoted column.
  3. Final Answer:

    You did not select an aggregation function for pivoting -> Option C
  4. Quick Check:

    Missing aggregation causes pivot error [OK]
Quick Trick: Always pick aggregation when pivoting multiple values [OK]
Common Mistakes:
  • Ignoring the aggregation step
  • Assuming pivot works without aggregation
  • Confusing numeric and text columns

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