Free practice · ordering · medium

Practice

Order the cleaning and validation workflow

Arrange a controlled data-cleaning workflow.

Confirmed duplicate · cleaning reconciliation

A controlled removal changes rows and revenue predictably

Row control

Raw4 rows
Clean3 rows

Revenue control

Raw$335
Clean$235

The $100 difference equals the one confirmed extraction duplicate; the raw layer and cleaning log remain preserved.

Arrange in the correct order
  1. 1. Record changes and unresolved exceptions
  2. 2. Reconcile counts, totals, and categories
  3. 3. Apply the rule to an analysis-ready copy
  4. 4. Document and approve the cleaning rule
  5. 5. Preserve the unchanged source