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In MySQL, a trigger is a stored program invoked automatically in response to an event such as insert, update, or delete that occurs in the associated table. For example, you can define a trigger that is invoked automatically before a new row is inserted into a table.
A trigger is a set of SQL statements, that is executed automatically in response to a specified event including INSERT, UPDATE, or DELETE on a particular table. The CREATE TRIGGER statement allows you to create a new trigger associated with a table.
Introduction to MySQL AFTER INSERT triggers. MySQL AFTER INSERT triggers are automatically invoked after an insert event occurs on the table. The following shows the basic syntax of creating a MySQL AFTER INSERT trigger: CREATE TRIGGER trigger_name. AFTER INSERT ON table_name FOR EACH ROW.
In this tutorial, you will learn how to create a MySQL AFTER UPDATE trigger to log the changes made to a table.
The SHOW TRIGGERS statement returns a result set that includes the following columns: trigger: the name of the trigger. event: the event that invokes the trigger e.g., INSERT, UPDATE, or DELETE. table: the table to which the trigger belongs. statement: the body of the trigger.
MySQL BEFORE UPDATE triggers are invoked automatically before an update event occurs on the table associated with the triggers. Here is the syntax for creating a MySQL BEFORE UPDATE trigger: CREATE TRIGGER trigger_name. BEFORE UPDATE ON table_name FOR EACH ROW.
MySQL events, commonly known as scheduled events, are the tasks that are executed according to a specified schedule. MySQL events are similar to cron jobs on Linux or task schedulers on Windows, providing a tool to automate recurring tasks within the MySQL database server.
MySQL BEFORE INSERT triggers are automatically fired before an insert event occurs on the table. The following illustrates the basic syntax of creating a MySQL BEFORE INSERT trigger: CREATE TRIGGER trigger_name. BEFORE INSERT ON table_name FOR EACH ROW. trigger_body;
MySQL triggers are stored programs executed automatically to respond to specific events associated with a table such as an insert, update or delete. This section shows you how to work with MySQL triggers effectively.
This tutorial shows you how to create multiple triggers for a table that have the same trigger event and action time in MySQL.