What is a trigger in SQL?
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A trigger in SQL is a special type of stored procedure that is automatically executed (or “fired”) in response to certain events on a table or view. Unlike normal stored procedures, triggers are not called explicitly by users or applications—they run automatically when specific database operations occur, such as an INSERT, UPDATE, or DELETE.
Triggers are mainly used to enforce business rules, maintain data integrity, and automate system tasks. For example, you can create a trigger that automatically updates a log table whenever a row in the main table is modified, or a trigger that prevents deletion of important records by rolling back the transaction if certain conditions are met.
There are different types of triggers:
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BEFORE triggers: Executed before the triggering action (like before inserting a record).
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AFTER triggers: Executed after the triggering action (like after updating a record).
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INSTEAD OF triggers: Executed in place of the triggering action (mainly used with views).
Benefits of triggers include ensuring automatic auditing, enforcing referential integrity, and applying complex validation rules beyond constraints. However, they must be used carefully, since too many triggers can make debugging harder and may slow down performance.
👉 In short, a trigger is a database object that listens to specific changes and reacts automatically, helping to maintain consistency and enforce rules without manual intervention.
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