What is PL/SQL? Oracle PL SQL Training is a Procedural Language extension of Structured Query Language (SQL). PL/SQL is specially designed for Database oriented activities. Oracle PL/SQL allows you to perform data manipulation operation those are safe and flexible. PL/SQL is a very secure functionality tool for manipulating, controlling, validating, and restricting unauthorized access data from the SQL database. Using PL/SQL we can improve application performance. It also allows to deal with errors so we can provide user friendly error messages. PL/SQL have a great functionality to display multiple records from the multiple tables at the same time. PL/SQL is capable to send entire block of statements and execute it in the Oracle engine at once.