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PostgreSQL 17 QuickStart Pro by Tessa Vorin (Ebook) - Everand

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MERGE INTO inventory t USING daily_shipments s ON t.product_id = s.product_id WHEN MATCHED AND s.quantity > 0 THEN UPDATE SET stock = t.stock + s.quantity WHEN MATCHED AND s.quantity = 0 THEN DELETE WHEN NOT MATCHED THEN INSERT VALUES (s.product_id, s.quantity); PostgreSQL 17 QuickStart Pro by Tessa Vorin (Ebook)

For maximum extension compatibility (specifically for pgvector , pg_analytics , and timescaledb ), use the official PostgreSQL Global Development Group (PGDG) repositories, but compile with --with-llvm for JIT compilation. For those ready to add these professional skills

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Instead of ON CONFLICT , use MERGE for conditional updates with multiple actions:

SELECT pid, usename, query, state, wait_event_type, wait_event FROM pg_stat_activity WHERE wait_event_type = 'Lock' ORDER BY query_start;