A trigger in MySQL is a stored programme that is run automatically in reaction to an event in the related table, such as an insert, update, or deletion. For example, before a new row is entered into a table, you can set a trigger that is automatically triggered.
In MySQL, a trigger is a collection of SQL statements stored in a system catalogue. It's a form of stored procedure that gets called automatically when something happens. Each trigger is tied to a specific table and is triggered by any DML statement like INSERT, UPDATE, or DELETE.
Any complicated data integrity rule needs to have triggers. You can't enforce this elsewhere but the database, otherwise you'll have data integrity issues. Unless you don't want to capture all database changes, they're also the best spot for auditing (which is the problem of auditing from the application).
A trigger is a sort of stored procedure that executes automatically when a database server event occurs. When a user attempts to edit data via a data manipulation language (DML) event, DML triggers are triggered. INSERT, UPDATE, and DELETE statements on a table or view are DML events.
A MySQL table can have up to SIX triggers.
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