How to Write Triggers in MariaDB?
Triggers in MariaDB are database objects that automatically perform an action when a specified event occurs. In MariaDB, the Triggers are created with the help of CREATE OR REPLACE TRIGGER Statement.
Syntax:
CREATE [OR REPLACE] TRIGGER [IF NOT EXISTS] trigger_name
{BEFORE | AFTER } {INSERT | UPDATE | DELETE}
ON table_name
FOR EACH ROW
[WHEN]
triggger_body;
Explanation: This query creates a trigger named trigger_name
that activates either before or after an insert, update, or delete operation on table_name
. The triggger_body
contains the actions to be executed for each row affected by the operation. The OR REPLACE
clause allows the trigger to be redefined if it already exists, and the IF NOT EXISTS
clause prevents an error if the trigger already exists.
MariaDB Create Triggers
Triggers are a very useful and powerful feature of MariaDB. It is a database object associated with a table that activates if an INSERT, UPDATE or DELETE operations are performed. The name itself reflects their action as they run immediately without any human intervention when the respective operations are performed.
In this article, you will learn about how to create triggers and use them easily so that we can automate complex tasks and perform data management easily.
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