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Distinct-values workflow

Extract Unique Values from a CSV Column

Create a reliable distinct-value list by handling blanks, case, whitespace and frequency counts deliberately.

Use the matching tool

Extract Unique CSV Values

Open Extract Unique CSV Values

What the error actually means

A unique-value list is only as consistent as the comparison rule. Active, active and active with a trailing space are different strings. Before collapsing them, decide whether case and whitespace carry meaning in that column.

Likely causes

  • Categories were entered inconsistently.
  • Blank values are included as a category.
  • Several spellings represent one concept.
  • The wrong column or header was selected.

Controlled distinct list

Problem

ACTIVE, Active, active, active␠

Correct pattern

Normalize the controlled status field, then extract active once with a frequency count

A safe repair workflow

  1. 1Profile raw values and frequencies.
  2. 2Choose case and whitespace rules for that field.
  3. 3Extract the distinct list.
  4. 4Review rare values as possible errors rather than deleting them.

How to verify the result

A file that downloads successfully is not automatically a correct file. Check the result at both the structural and business-data levels:

  • Counts sum to the non-missing records.
  • Blank handling is explicit.
  • Rare valid categories remain.
  • The exported list contains no unintended duplicates.

Read the deeper guides

How to Clean CSV Data Without Hiding the Original ProblemsLearn practical techniques to clean messy CSV files. Remove duplicates, fix formatting, and standardize data without Excel crashes or complex scripts.Find Fuzzy Duplicates in CSV FilesFind near-duplicate rows using similarity matching. Catch typos like 'Jon Smith' vs 'John Smith'. Free online tool.