Web Reference: Feb 26, 2026 · Triggers can be attached to tables (partitioned or not), views, and foreign tables. On tables and foreign tables, triggers can be defined to execute either before or after any INSERT, UPDATE, or DELETE operation, either once per modified row, or once per SQL statement. Mar 27, 2026 · In this tutorial, you learned what database triggers are and how they work in PostgreSQL. You built three practical triggers: an automatic timestamp updater, a full audit logging system, and a data validation guard. Jul 15, 2025 · A PostgreSQL trigger is a powerful tool that allows automatic invocation of a function whenever a specified event occurs on a table. Events that can trigger a function include INSERT, UPDATE, DELETE, or TRUNCATE.
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