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Triggers

A trigger is a set of statements that run when an event occurs on a table.

Title	Description
Trigger Overview	Statements run when an event occurs on a table
Binary Logging of Stored Routines	Stored routines require extra consideration when binary logging.
CREATE TRIGGER	Create a new trigger.
DROP TRIGGER	Drops a trigger.
Information Schema TRIGGERS Table	Information about triggers
Running Triggers on the Slave for Row-based Events	Running triggers on the slave for Row-based events
SHOW CREATE TRIGGER	Shows the CREATE TRIGGER statement used to create the trigger
SHOW TRIGGERS	Shows currently-defined triggers
Trigger Limitations	Restrictions applying to triggers.
Triggers and Implicit Locks	Implicit locks due to triggers and LOCK TABLE

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https://mariadb.com/kb/en/triggers/