Practical data engineering tutorials, SQL optimization, and pipeline architecture from a working practitioner.

How to Fix Duplicate Records in Delta Tables [2026 Guide]

Your pipeline looks clean. Your row counts match. But your downstream reports show inflated numbers, and your stakeholders are asking questions you can't answer yet. Sound familiar? Duplicate records in Delta tables are one of the most common — and sneakiest — data quality issues in production pipelines. They don&