Why would an after trigger be useful?

Why would an after trigger be useful?

Here are some key characteristics of AFTER triggers: After triggers are run after a DML action, such as an INSERT statement and any ensuing referential cascade actions and constraint checks have run. You can’t cancel the database action using an AFTER trigger. This is because the action has already completed.

Should I use DB triggers?

Triggers are a requirement for any complex data integrity rules. These cannot be enforced anywhere except the database or you will have data integrity problems. They are also the best place for auditing unless you don’t want to capture all changes to the database (which is the problem of auditing from the application).

What to do after insert trigger in SQL Server?

AFTER INSERT Trigger. Unlike Oracle, where a row-level BEFORE INSERT trigger was used to set the column value, in SQL Server, you can use a statement-level AFTER INSERT trigger and update the column value after it has been inserted to the table.

When to use statement level instead of insert trigger?

SQL Server: Now similar to Oracle BEFORE INSERT trigger, if a user explicitly specifies a datetime, it will be overwritten to the current datetime by the trigger: SQL Server: In SQL Server, you can also use a statement-level INSTEAD OF INSERT trigger to overwrite inserted values.

When to use insert trigger instead of insert trigger in DML?

INSTEAD OF INSERT trigger requires one DML operation, you only need to modify values and insert rows, no subsequent update is required: This trigger also replaces any value inserted in the created column by a user with GETDATE () function: Firstly, let’s see how the trigger affects the insert performance in Oracle.

When does insert trigger fire in Employee table?

Remember, After Insert trigger will fire after the completion of Insert operation on Employee table. Once it completes inserting into the Employee table, it will start inserting into Employee audit table. If it fails to insert into the Employee table then it won’t insert into the Audit table.