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Can we have triggers on views?
Triggers may be created on views, as well as ordinary tables, by specifying INSTEAD OF in the CREATE TRIGGER statement. If one or more ON INSERT, ON DELETE or ON UPDATE triggers are defined on a view, then it is not an error to execute an INSERT, DELETE or UPDATE statement on the view, respectively.
Can a trigger be written for a view *?
Yes, you can create triggers on views. (Since at least SQL Server 2000.) If you create a trigger on a view, it won’t fire on inserts to the base table. If you want something to happen when you insert data into a base table, create a trigger on the base table.
Can you write to a view?
You can’t modify data in views that use GROUP BY or DISTINCT statements. All columns being modified are subject to the same restrictions as if the statements were being executed directly against the base table. Text and image columns can’t be modified through views.
Under which two circumstances do you design database triggers?
Under which circumstance do you design database triggers? To duplicate the functionality of other triggers. To replicate built-in constraints in the Oracle server such as primary key and foreign key. When a specific operation is performed, related actions are performed.
Which are 2 different types of triggers?
What are the types of triggers?
- DDL Trigger.
- DML Trigger.
- Logon Trigger.
How does create trigger for update work in SQL Server?
For example, if CREATE TRIGGER FOR UPDATE is run for a table that already has an UPDATE trigger, an additional update trigger is created. In earlier versions of SQL Server, only one trigger for each INSERT, UPDATE, or DELETE data modification event is allowed for each table.
What happens if trigger fails to update Employee table?
And if the trigger fails to update the Employee table, then it won’t insert into the Audit table. TIP: You can refer TRIGGERS , AFTER INSERT TRIGGERS, and AFTER DELETE TRIGGERS article in SQL Server.
Can you use a trigger on a non updateable view?
Additionally, the columns being modified cannot be affected by GROUP BY, HAVING, or DISTINCT clauses. The view’s code must not use the TOP clause together with the WITH CHECK OPTION clause. The only way to make data changes on a non-updateable view is by using INSTEAD OF triggers. This way you can use procedural code to overcome the limitation.
Can you use a trigger on a view in SQL Server?
SQL Server triggers can be useful, but also tricky to use. Most people think about putting triggers on tables, but did you know that you could also create triggers on views? In this tip we will cover how this can be done as well as how to control what can be updated using a view and how to control with a trigger.