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A trigger is a specification that the database should automatically execute a particular function whenever a certain type of operation is performed. Triggers can be attached to tables (partitioned or ...

A data change trigger is declared as a function with no arguments and a return type of trigger. Note that the function must be declared with no arguments even if it expects to receive some arguments ...

While many uses of triggers involve user-written trigger functions, PostgreSQL provides a few built-in trigger functions that can be used directly in user-defined triggers. These are summarized in ...

CREATE TRIGGER creates a new trigger. CREATE OR REPLACE TRIGGER will either create a new trigger, or replace an existing trigger. The trigger will be associated with the specified table, view, or ...

ALTER TRIGGER changes properties of an existing trigger. The RENAME clause changes the name of the given trigger without otherwise changing the trigger definition. If the table that the trigger is on ...

Here is a very simple example of a trigger function written in C. (Examples of triggers written in procedural languages can be found in the documentation of the procedural languages.) This is the ...

The name to give the new trigger. This name must be unique within the database. The name of the event that triggers a call to the given function. See Section 38.1 for more information on event names.

This chapter provides general information about writing trigger functions. Trigger functions can be written in most of the available procedural languages, including PL/pgSQL (Chapter 41), PL/Tcl ...

To supplement the trigger mechanism discussed in Chapter 37, PostgreSQL also provides event triggers. Unlike regular triggers, which are attached to a single table and capture only DML events, event ...

The catalog pg_trigger stores triggers on tables and views. See CREATE TRIGGER for more information.