What is trigger in SQL?

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Thereasa Joe

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A trigger is a special SQL procedure that runs automatically in response to events like INSERT, UPDATE, or DELETE on a table.
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Data Analyst with 10 years of experience in Fintech, Product ,and IT Services

A trigger in SQL is a set of SQL statements that automatically execute or "fire" when a specific event occurs in a database table, such as INSERT, UPDATE, or DELETE. Triggers are often used to enforce business rules, validate data, or keep logs of changes. Key points about triggers: Event-driven:...
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A trigger in SQL is a set of SQL statements that automatically execute or "fire" when a specific event occurs in a database table, such as INSERT, UPDATE, or DELETE. Triggers are often used to enforce business rules, validate data, or keep logs of changes. Key points about triggers: Event-driven: Triggers execute automatically when a specified event occurs. Types: BEFORE Trigger: Runs before the operation (INSERT, UPDATE, DELETE). AFTER Trigger: Runs after the operation. Usage: Can be used for auditing, enforcing constraints, and more. Example: To create a trigger that logs changes made to a table: CREATE TRIGGER LogChanges ON Employees AFTER UPDATE AS BEGIN INSERT INTO EmployeeAudit (EmployeeID, OldSalary, NewSalary, ChangeDate) SELECT EmployeeID, deleted.Salary, inserted.Salary, GETDATE() FROM inserted INNER JOIN deleted ON inserted.EmployeeID = deleted.EmployeeID; END; This trigger logs salary changes into the EmployeeAudit table after an update on the Employees table. Here is my number Call 073-1485-0321. read less
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