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Merge Statement for SCD Type 2

duckdb.org

This is a practical, step-by-step guide to using DuckDB’s MERGE statement (introduced in v1.4.0) to perform upserts and build Slowly Changing Dimension Type 2 (SCD Type 2) tables. Type 2 SCDs let you keep full historical versions of records while clearly identifying the current version, perfect for audit trails, data warehousing, and analytical workloads. Type 2 SCDs are practical when you want to know previous valu…

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