Mysql trigger for each row. .

Mysql trigger for each row. Understanding and using triggers effectively can greatly enhance the functionality and reliability of your database operations. Learn how the FOR EACH ROW clause functions in MySQL triggers and its significance in database operations. To affect trigger order, specify a clause after FOR EACH ROW that indicates FOLLOWS or PRECEDES and the name of an existing trigger that also has the same trigger event and action time. For example, if a table has 100 rows inserted, updated, or deleted, the trigger is automatically invoked 100 times for the 100 rows affected. A row-level trigger is activated for each row that is inserted, updated, or deleted. The statement following FOR EACH ROW defines the trigger body; that is, the statement to execute each time the trigger activates, which occurs once for each row affected by the triggering event. Jul 23, 2025 · By defining triggers with the CREATE TRIGGER statement, you can enforce business rules, maintain logs, and ensure data integrity automatically. . The following sections describe the syntax for creating and dropping triggers, show some examples of how to use them, and indicate how to obtain trigger metadata. quucm vrgjc hmysx pdq gqydba aonag tmqa wef gxqduwi gbv