Do you use triggers? What types of triggers have been used and how do they work in conjunction with transactions?

Triggers are special procedures in a database that automatically execute in response to certain events (INSERT, UPDATE, DELETE).

Types of triggers:

• BEFORE triggers: execute before data modification, allowing to check or modify data before the operation.
• AFTER triggers: execute after data modification, used for logging, updating related tables.
• INSTEAD OF triggers: replace the standard action (for example, for views).

In conjunction with transactions, triggers execute within the same transaction as the calling operation. This means if the transaction is rolled back, the changes made by the trigger are also rolled back. This ensures data integrity.

Example: when inserting a record into the orders table, a BEFORE trigger can check for stock availability, and an AFTER trigger can update sales statistics. If the transaction is rolled back, all changes, including trigger actions, are canceled.