Trigger updating column Wep omele sexs cam

1) Row level trigger - An event is triggered for each row upated, inserted or deleted.For Example: The price of a product changes constantly.It is important to maintain the history of the prices of the products.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.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.

We can create a trigger to update the 'product_price_history' table when the price of the product is updated in the 'product' table.

1) Create the 'product' table and 'product_price_history' table Once the above update query is executed, the trigger fires and updates the 'product_price_history' table.


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