Oracle PLSQL Tutorial 42- Before and After Trigger in PLSQL #PL/SQL #oracleplsql

In this Video, We are explaining about Before and After Trigger in PLSQL with Example.

What is Before Trigger?

Data Validation:
Before inserting an employee record, a trigger can check if the salary entered is within the valid range for their position.
Setting Default Values:
Before inserting an employee record, a trigger can automatically set the employee joining date to the current date and time.
Preventing Invalid Data:
Before deleting a employee record, a trigger can check if the employee has any dues and prevent the deletion if they do.

What is After Trigger?
Auditing:
After an employee record is updated, a trigger can log the changes made to an audit table.
Notifications:
After a new employee is joined, a trigger can send an email notification to the manager and the other department.
Updating Related Tables:
After a employee salary is updated, a trigger can update the SALARY in related tables like HIKE.

Advantages of Before and After Triggers
Data Integrity:
Enforce business rules and constraints to ensure data accuracy and consistency.
Automation:
Automate tasks that would otherwise require manual intervention, saving time and effort.
Improved Security:
Prevent unauthorized data modifications and enhance the overall security of the database.
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