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- Merge Statement for SCD Type 2 9414
- 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 record
...VARCHAR, location VARCHAR, begin_date DATE, end_date DATE, is_current BOOLEAN ); INSERT INTO incoming_ducks VALUES (101, 'Quackers', 'Mallard', 'Pond B', CURRENT_DATE - INTERVAL '1 day', NULL, true), (102, 'Waddles', 'Pekin', 'Pond A', CURRENT_DATE - IN...CREATE SEQUENCE IF NOT EXISTS duck_record_seq START 1; INSERT INTO master_ducks VALUES (nextval('duck_record_seq'), 101, 'Quackers', 'Mallard', 'Pond A', CURRENT_DATE - INTERVAL '2 days', NULL, true), (nextval('duck_record_seq'), 102, 'Waddles', 'Pekin'...he master table after running the merge statement and the post update insert statement, we can see the individual rows for Quackers . To view the original row of data that is historical: SELECT * FROM master_ducks WHERE duck_name = 'Quackers' AND is_curr... - https://man.mtool.work/duckdb/2.0/guides/sql_features/merge.html
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