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A trigger in MySQL is a set of SQL statements that reside in a system catalog. It is a special type of stored procedure that is invoked automatically in response to an event. Each trigger is associated with a table, which is activated on any DML statement such as INSERT, UPDATE, or DELETE.
Jul 4, 2019 · A MySQL trigger is a stored program (with queries) which is executed automatically to respond to a specific event such as insertion, updation or deletion occurring in a table. There are 6 different types of triggers in MySQL:
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.
To create a trigger or drop a trigger, use the CREATE TRIGGER or DROP TRIGGER statement, described in Section 15.1.22, “CREATE TRIGGER Statement”, and Section 15.1.34, “DROP TRIGGER Statement”.
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.
Apr 12, 2021 · What is a Trigger in MySQL? A trigger is a named MySQL object that activates when an event occurs in a table. Triggers are a particular type of stored procedure associated with a specific table. Triggers allow access to values from the table for comparison purposes using NEW and OLD. The availability of the modifiers depends on the trigger ...
A trigger is defined to activate when a statement inserts, updates, or deletes rows in the associated table. These row operations are trigger events. For example, rows can be inserted by INSERT or LOAD. DATA statements, and an insert trigger activates for each inserted row.
A trigger is a named database object that is associated with a table, and that activates when a particular event occurs for the table. The trigger becomes associated with the table named tbl_name, which must refer to a permanent table. You cannot associate a trigger with a TEMPORARY table or a view.
Nov 16, 2021 · The MySQL trigger is a special type of stored procedure that’s automatically executed by MySQL in response to an event. A MySQL trigger can store SQL statements to execute when there’s an INSERT , UPDATE , or DELETE statement executed on a specific table.
Aug 19, 2022 · A trigger is a set of actions that are run automatically when a specified change operation (SQL INSERT, UPDATE, or DELETE statement) is performed on a specified table. Triggers are useful for tasks such as enforcing business rules, validating input data, and keeping an audit trail. Contents: Uses for triggers. Benefits of using triggers in business
