What is the usage of Oracle row-level triggers?

An Oracle row-level trigger is an automated operation triggered at the row level of a table, activated when specific data operation events, such as inserting, updating, or deleting rows, occur and perform predefined actions.

“Row-level triggers can be used to achieve the following functions:”

Data constraints: Data can be validated or modified based on specific conditions before or after inserting, updating, or deleting rows. For example, row-level triggers can be used to check the integrity, consistency, or validity of data and prevent operation execution if conditions are not met.

2. Audit tracking: You can use row-level triggers to record operations on data within a table, such as who inserted, updated, or deleted data at what time. This is particularly helpful for tracking and auditing data changes.

Data derivation: Row-level triggers can be used to automatically calculate or derive other relevant data when inserting, updating, or deleting rows. For example, a trigger can be used to automatically calculate and update the total salary in the total salary table when updating an employee’s salary.

Data duplication: Row-level triggers can be used to automatically copy data to other tables when inserting, updating, or deleting rows. This is very helpful in scenarios such as data synchronization or data warehousing.

Row-level triggers can be defined on a table to automatically trigger specific actions when certain trigger conditions are met. Triggers can be of type BEFORE (triggering before a data operation) or AFTER (triggering after a data operation). PL/SQL or SQL statements can be used in triggers to define the actions to be executed.

In conclusion, Oracle row-level triggers offer a flexible and automated way to control and manage data operations in tables.