Handling Duplicates

Summary

Distinguishing true duplicate records from legitimately repeated events (e.g. the same customer ordering twice) before blindly deduplicating a dataset.

• 1Practice identifying duplicates using a full-row match versus a key-column match.
• 2Investigate a few 'duplicate' rows manually before deciding whether to remove them.
• 3Learn why deduplication logic should be documented, not just applied silently.