What is MySQL trigger?
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.
What happens if trigger fails SQL?
The trigger statement will work under the scope of the same transaction that fires that trigger. This means that the transaction will not be committed completely until the trigger statement is completed successfully. On the other hand, the transaction will be rolled back if the trigger statement fails.
What can not have a trigger associated with it?
Since triggers execute as part of a transaction, the following statements are not allowed in a trigger:
- All create commands, including create database, create table, create index, create procedure, create default, create rule, create trigger, and create view.
- All drop commands.
- alter table and alter database.
How many triggers are possible in MySQL?
There are 6 different types of triggers in MySQL: 1. Before Update Trigger: As the name implies, it is a trigger which enacts before an update is invoked. If we write an update statement, then the actions of the trigger will be performed before the update is implemented.
How to create MySQL trigger?
event
What is an example of a trigger in SQL?
A SQL trigger is a database object just like a stored procedure, or we can say it is a special kind of stored procedure which fires when an event occurs in a database. We can execute a SQL query that will “do something” in a database when an event is fired. For example, a trigger can be set on a record insert in a database table.
How can MySQL handle the errors during trigger execution?
the operation on the corresponding row is not performed.