[Solved] Why does CLEAN(TRIM([TextColumn])) sometimes produce the same result as TRIM([TextColumn])? — Ans: Because CLEAN only removes non-printable characters, which may not exist | Power BI

Power BI - Data Cleaning with Power Query

Why does CLEAN(TRIM([TextColumn])) sometimes produce the same result as TRIM([TextColumn])?

ABecause both functions convert text to uppercase

BBecause CLEAN only removes non-printable characters, which may not exist

CBecause CLEAN removes spaces, same as TRIM

DBecause TRIM removes non-printable characters too

Step-by-Step Solution

Solution:

Step 1: Understand CLEAN and TRIM roles
CLEAN removes non-printable chars; TRIM removes spaces at edges.
Step 2: Reason about input
If text has no non-printable chars, CLEAN changes nothing, so result equals TRIM alone.
Final Answer:
Because CLEAN only removes non-printable characters, which may not exist -> Option B
Quick Check:
CLEAN affects non-printable chars only [OK]

Quick Trick: CLEAN does nothing if no hidden chars exist [OK]

Common Mistakes:

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Why does CLEAN(TRIM([TextColumn])) sometimes produce the same result as TRIM([TextColumn])?