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What are the different types of triggers in MySQL?
There are 6 different types of triggers in MySQL:
- Before Update Trigger: As the name implies, it is a trigger which enacts before an update is invoked.
- After Update Trigger:
- Before Insert Trigger:
- After Insert Trigger:
- Before Delete Trigger:
- After Delete Trigger:
Is trigger enabled?
To enable a trigger, causes it to fire when any Transact-SQL statements on which it was originally programmed are run. Triggers are disabled by using DISABLE TRIGGER. DML triggers defined on tables can also be disabled or enabled by using ALTER TABLE.
What is the create trigger statement in MySQL?
Introduction to MySQL CREATE TRIGGER statement. The CREATE TRIGGER statement creates a new trigger. Here is the basic syntax of the CREATE TRIGGER statement: CREATE TRIGGER trigger_name { BEFORE | AFTER } { INSERT | UPDATE | DELETE } ON table_name FOR EACH ROW trigger_body;
How does MySQL handle errors during trigger execution?
MySQL handles errors during trigger execution as follows: If a BEFORE trigger fails, the operation on the corresponding row is not performed. A BEFORE trigger is activated by the attempt to insert or modify the row, regardless of whether the attempt subsequently succeeds.
How to change the Order of triggers in MySQL?
By default, triggers that have the same trigger event and action time activate in the order they were created. 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.
Where do I find triggers in MySQL Workbench?
Then, show all triggers in the current database by using the SHOW TRIGGERS statement: In addition, if you look at the schema using MySQL Workbench under the employees > triggers, you will see the before_employee_update trigger as shown in the screenshot below: