What is PL/SQL | Oracle Tutorial
https://www.oracletutorial.com/plsql-tutorial/what-is-plsql/
PL/SQL is a highly structured and readable language. Its constructs express the intent of the code clearly. PL/SQL is a standard and portable language for Oracle Database development.
PL/SQL Introduction - GeeksforGeeks
https://www.geeksforgeeks.org/plsql-introduction/
PL/SQL is basically a procedural language, which provides the functionality of decision making, iteration and many more features of procedural programming languages.
PL/SQL — Oracle SQL & PL/SQL Optimization for Developers...
https://oracle.readthedocs.io/en/latest/plsql/
PL/SQL¶. PL/SQL stands for Procedural Language/Structured Query Language and it is Oracle's extension of SQL that aims to seamlessly process SQL commands.
Oracle PL/SQL Tutorial
http://www.java2s.com/Tutorial/Oracle/CatalogOracle.htm
7.12.Cross Join SQL 92 Syntax( 1 ). 7.5.Outer Joins Limitations( 3 ).