What are PL/SQL Views?

What are PL/SQL Views?

A PL/SQL view is a virtual table produced by a stored query. Unlike the real tables that hold the data, views never save data by themselves. Views exactly create the dynamic view of data that comes from one or multiple tables. A view behaves like a saved query, which enables easy access to data as it encapsulates all complex join, aggregations, and filters in one object....

Set Up an Environment

Let’s consider one table called employee which we will use as an example for understanding the view in a better manner....

CREATE VIEW

In PL/SQL, creating a view is achieved using the CREATE VIEW statement, which allows us to define a virtual table based on the results of a query. Let’s understands with an example using our “employee” table:...

UPDATE VIEW

Generally, the PL/SQL views are read-only, but it is still possible to update data through a view under some conditions. Let’s understand this with an example:...

DROP VIEW

Finally, if we no longer need a view, we can remove it from the database using the DROP VIEW statement. Let’s understand this with an example:...

Conclusion

Using PL/SQL views simplify the access to the data and improve security and code reusability. Through the knowledge of how to create, update, and drop views, developers will be able to use these features to simplify the database operations and enhance the system efficiency. Whether it is utilized for the reason of data reporting, security enforcement or data integration, the view is a key function in database management and application development....