How to CREATE trigger ON DELETE?
In this syntax: First, specify the name of the trigger that you want to create in the CREATE TRIGGER clause. Second, use AFTER DELETE clause to specify the time to invoke the trigger. Third, specify the name of the table, which the trigger is associated with, after the ON keyword.
How to CREATE DELETE trigger in MySQL?
The BEFORE DELETE trigger syntax parameter can be explained as below:
- First, we will specify the name of the trigger that we want to create.
- Second, we will specify the trigger action time, which should be BEFORE DELETE.
- Third, we will specify the name of a table to which the trigger is associated.
Is there a trigger to not delete records?
That Trigger worked. To not delete records (for auditing purposes, as per OP’s post), but to flag the record deleted, and change your view to reflect this, I do the following. Create the trigger as per the above, but alter it into an UPDATE statement…
How to override SQL Server trigger for deletes?
Be aware that it will rollback the whole transaction in case yuo’re deleting multiple rows among which at least one is “Peter”. 2) You override the way SQL Server does DELETEs on the table, using an INSTEAD OF trigger. In this case, you silently ignore DELETEs for the row “Peter”.
How to create a PostgreSQL trigger for deleting old records?
In the following example we’ve created a TRIGGER that is called automatically by PostgreSQL that has the effect of deleting ‘stale’ records. The obvious advantage being that it’s always associated with the database and will be included in any backups. It also doesn’t require any CRON script.
How does the before delete trigger work in MySQL?
The succeeding BEFORE DELETE trigger will add a new row in the table Salary_logs before the delete query from Emp_data table is executed to delete a row. The trigger code is written as follows. Now, we will check the trigger by deleting a row from Emp_data table.