What is a trigger in MySQL

A trigger in MySQL is a database object that is automatically executed or fired when specific events occur on a particular table. Triggers can be used to enforce business rules, validate input data, log changes to data, or maintain audit trails. There are three primary types of triggers in MySQL:

  • BEFORE Trigger: Executes before an insert, update, or delete operation.
  • AFTER Trigger: Executes after an insert, update, or delete operation.
  • INSTEAD OF Trigger: Executes in place of a delete or update operation (mainly used for views).

Triggers help automate certain actions in the database, ensuring that the database remains consistent and meets business requirements.


triggers MySQL triggers database triggers SQL triggers before trigger after trigger instead of trigger

Related Questions

How do I avoid rehashing overhead with std::set in multithreaded code?

How do I find elements with custom comparators with std::set for embedded targets?

How do I erase elements while iterating with std::set for embedded targets?

How do I provide stable iteration order with std::unordered_map for large datasets?

How do I reserve capacity ahead of time with std::unordered_map for large datasets?

How do I erase elements while iterating with std::unordered_map in multithreaded code?

How do I provide stable iteration order with std::map for embedded targets?

How do I provide stable iteration order with std::map in multithreaded code?

How do I avoid rehashing overhead with std::map in performance-sensitive code?

How do I merge two containers efficiently with std::map for embedded targets?