Tech Faculty

PL/SQL DML triggers are used to automatically execute a set of statements or procedures in response to certain data manipulation language (DML) events, such as before or after an INSERT, UPDATE, or DELETE operation is performed on a table.

In particular, the BEFORE INSERT trigger is executed before a new row is inserted into a table, allowing you to modify the new row's values or perform additional checks before the insert takes place. Similarly, the BEFORE UPDATE trigger is executed before a row is updated, allowing you to modify the updated row's values or perform additional checks before the update takes place. The BEFORE DELETE trigger is executed before a row is deleted, allowing you to perform additional checks or actions before the deletion takes place.

By using these triggers, you can ensure that certain business rules or conditions are met before or after data is modified, improving the integrity and consistency of your database.

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