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Answer» There are FOLLOWING TWO types of triggers:
- Database triggers are executed implicitly whenever a Data Manipulation Language (DML) statement is carried out on a database table or a Data Definition Language (DDL) statement, such as CREATE OR ALTER, is performed on the database. They may also be executed when a USER or database event occurs, such as a user logs on or a database is shutdown.
- APPLICATION triggers are executed implicitly whenever a DML event takes place within an application, such as WHEN_NEW_FORM_INSTANCE in the Oracle FORMS application.
There are following two types of triggers:
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