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4)If you ROLLBACK the transaction before committing to the database, the data inserted to the table is also rolled back.There are two types of triggers based on the which level it is triggered.

It is important to maintain the history of the prices of the products.1) Row level trigger - An event is triggered for each row upated, inserted or deleted.2) Statement level trigger - An event is triggered for each sql statement executed.A trigger is a pl/sql block structure which is fired when a DML statements like Insert, Delete, Update is executed on a database table.A trigger is triggered automatically when an associated DML statement is executed.

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