Can we create triggers on views in Oracle?
In Oracle, you can create an INSTEAD OF trigger for a view only. You cannot create an INSTEAD OF trigger for a table.
Can triggers be created 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.
Which trigger can be defined on views?
SQL Server Triggers on Views There are two kinds of DML triggers the FOR (or AFTER) trigger and the INSTEAD OF trigger, but the only one you can use with views are INSTEAD OF triggers. In contrary to the AFTER type which fires after an event, the INSTEAD OF trigger executes instead of the firing statement.
Can a trigger be written for a view Mcq?
Explanation: Triggers are automatically generated when a particular operation takes place. Explanation: The triggers run after an insert, update or delete on a table. They are not supported for views.
What is instead of insert trigger?
An INSTEAD OF trigger is a trigger that allows you to skip an INSERT , DELETE , or UPDATE statement to a table or a view and execute other statements defined in the trigger instead. The actual insert, delete, or update operation does not occur at all.
Which clause is used for creating trigger on a view?
The INSTEAD OF clause is used for creating trigger on a view.
How do you view triggers?
To view database level triggers, Login to the server using SQL Server management studio and navigate to the database. Expand the database and navigate to Programmability -> Database Triggers. To view triggers at the server level, Login to Server using SSMS and navigate to Server Objects and then Triggers folder.
What is trigger and types of triggers in Oracle?
Types of Triggers in Oracle STATEMENT level Trigger: It fires one time for the specified event statement. ROW level Trigger: It fires for each record that got affected in the specified event. ( only for DML) Classification based on the Event. DML Trigger: It fires when the DML event is specified (INSERT/UPDATE/DELETE)
What is a trigger in Oracle?
Oracle allows you to define procedures that are implicitly executed when an INSERT, UPDATE, or DELETE statement is issued against the associated table. These procedures are called database triggers. A trigger can include SQL and PL/SQL statements to execute as a unit and can invoke stored procedures.
What are types of triggers in Oracle?
There are 3 different types of event triggers, they are:
- DDL EVENT TRIGGER. It fires with the execution of every DDL statement(CREATE, ALTER, DROP, TRUNCATE).
- DML EVENT TRIGGER. It fires with the execution of every DML statement(INSERT, UPDATE, DELETE).
- DATABASE EVENT TRIGGER.
How do I create an oracle trigger?
And in this tutorial I am just giving the simple tutorial to how to create a trigger in Oracle Form’s object navigator. 1. Click on the Triggers node just below the Form name and then click on + icon. 2. Then Trigger Dialog window will open then select trigger you want to create and click on OK button.
Can we write a trigger on view?
1 Answer 1. 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.
How does a trigger work in Oracle?
TRIGGERS are stored programs that are fired by Oracle engine automatically when DML Statements like insert, update, delete are executed on the table or some events occur. The code to be excecuted in case of a trigger can be defined as per the requirement.
What is a default trigger in Oracle?
The default master-detail triggers enforce coordination between records in a detail block and the master record in a master block. Unless you are developing your own custom block-coordination scheme, you do not need to define these triggers yourself.