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A practical walkthrough of how duplicate records in a SQL query caused operational risk in a nutrition intervention project. The author's initial INNER JOIN query correctly identified baby group assignments but allowed the same baby ID to appear multiple times, risking double-counting and unnecessary supplement distribution. The fix uses a CTE combined with ROW_NUMBER() and PARTITION BY baby_id to retain only the earliest valid record per baby, eliminating duplicates and protecting project budget.

How Duplicate Records in SQL Can Cause Real Budget Loss — And How I Prevented It

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