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DuckDB 2.0 ドキュメント 全文検索
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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
...HAR, 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 - INTERVAL '1 day', NUL...L, true), (104, 'Splash', 'Muscovy', 'Pond C', CURRENT_DATE - INTERVAL '1 day', NULL, true), (105, 'Puddles', 'Indian Runner', 'Relocated', CURRENT_DATE - INTERVAL '...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', 'Pond A', CURRENT... - https://man.mtool.work/duckdb/2.0/guides/sql_features/merge.html
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