What is PL/SQL (Procedural Language/Structured Query Language)?

PL/SQL (Procedural Language / Structured Query Language) is an extension of SQL that is used with Oracle database.

It is a programming language designed to work with the database and allows developers to create, manage and execute procedural code like functions, procedures, packages and triggers.

Why do we need PL/SQL?

Basically, SQL is a query language It is not a typical procedural programming language like C or C++. So it doesn’t have facilities like database packages, procedures, functions, if-else, loops etc.

So in order to have those benefits of constructs like looping, decision making using if-else or using functions, which are reusable blocks of code in SQL, this is a procedural language extension created by Oracle.

What is PL/SQL Block?

PL/SQL block is a set of instructions to perform some tasks. Usually a PL/SQL block has three sections:

Declaration

Declaration is an optional section which begins with the keyword “DECLARE”. You have to declare all the variables that you are going to use in your PL/SQL code.

Executable

Executable section is mandatory and it starts with the keyword “BEGIN” and end with the keyword “END”. This is the part where you write your actual code like if-else, loops etc. Usually you write SQL queries in this part. It must has at least one executable statement even if it is the NULL statement which does nothing.

Exception

A PLSQL block has an exception section which start with the keyword “Exception”. It is also an optional section. Whenever something bad happens in the earlier sections, you can handle that in EXCEPTION sections.

PL/SQL is a powerful language in the Oracle framework for developing database-centric applications, data manipulation scripts, functions, database triggers and stored procedures. It has integration with SQL that allows developers to use SQL statements directly within PL/SQL blocks.

Its procedural capabilities, performance optimizations and security features make it powerful tool and a good choice for developer to develop efficient applications on Oracle platforms.

I hope you enjoyed this article, I am an expert in PL/SQL, if you need any support for your existing project or any new project or you need any API in PL/SQL, please contact me.

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