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April 15th, 2019

What is SQL?

SQL is the acronym for Structured Query Language and it is a domain-specific language used primarily in designing and programming tasks. SQL manages data in RDBMS i.e. relational database management system.


Even SQL is useful in various types of RDSMS tasks i.e. Relational Data Stream Management System. Moreover, Structured Query Language deals with structured data where you find relations between its different variables or entities.

Why SQL ?

Records Retrieval Process

SQL queries are useful to retrieve data in large numbers from any database in no time and in an efficient way.

Communicate with the Database

As an interactive language, you can use SQL to communicate with the database and in turn, get answers to various complex queries within only a few seconds.

Eliminates the Requirement of Writing Codes

Standard SQL eliminates the requirement of any writing any code. Because of this, you can manage the database systems easily without writing a substantial amount of programming code.

Scope to Create Different Views of a Database Structure

With the help of SQL language, users may create different views of the existing database structure to meet the requirement of different users.

Efficient Support and Operation

Standard Query Language supports mainframes, online servers, tablets, PCs and laptops.
You can operate SQL on any local system with internet and intranet and move the database in between different devices.

Perfect for Client-Server Architecture

SQL supports client-server architecture, as it connects front-end computer devices i.e. clients and back-end databases i.e. servers.

Useful for Three-Tiered Architecture

SQL is used for three-tiered internet architecture consists of an application server, database and client computers.

SQL Database Uses Long-established Standards

Databases of the Standard Query Language use long-established standards adopted by ISO i.e. International Organization for Standardization and ANSI i.e. American National Standard Institutes.
Click Here ->  Useful Tips from Experienced SQL Practitioners

What is PL/SQL?

PL/SQL is the abbreviated form of Procedural Language/ Structured Query Language used mainly in Oracle. With PL/SQL, any programmer writes codes in procedural formats.
PL/SQL architecture consists of an engine, block and data server. Thus, other than data manipulation power, PL/SQL has the processing power to create the most powerful SQL query.
The main role of PL/SQL is to give instructions to the compiler to perform the type of functions and how to perform based on its procedural way.  Along with this, it provides relatively higher control to programmers with the application of object-oriented concepts, loops and conditions.
Click Here -> PL/SQL Interview Questions and Answers

Why PL/SQL ?

Reduces the Network Traffic

One of the biggest advantages of PL/SQL is that it reduces the overall network traffic, as it consists of a complete block of various SQL statements to execute in an Oracle Engine simultaneously.

Displays Multiple Records

PL/SQL procedural language displays multiple records from multiple numbers of tables at the same time.

Outstanding Development Tool

PL/SQL is an outstanding development tool to perform data manipulation and to accomplish looping, conditional checking and branching operations.

Perfect to Handle Errors

A large number of software engineers and web developers choose PL/SQL to handle errors. Whenever you encounter errors the PL/SQL, i.e. the advanced version of query language not only handles them smartly but also displays error messages in a user-friendly way.

Executes Blocks and Statements Spontaneously

PL/SQL sends the complete block of various statements to execute them in its Oracle Engine spontaneously.

Controls Declare Variables

PL/SQL provides control to various declare variables and provides them access inside the block. Declared variables are useful while you have to process any query.

Independent Applications in the Query Language

Applications in the extended query language are of independent ones to operate in any almost every type of computing device.

Portable Applications

PL/SQL possesses portable applications in almost every type of operating system.

No Longer Requires Using Oracle Engine

Procedural Language/ Structured Query Language eliminate the use of Oracle Engine to perform calculations. Instead, it does calculations both quickly and efficiently to boost the overall transaction performance.

Secured Functional Tool

Procedural Language/ Structured Query Language (PL/SQL) is one of the highly secured functional tools used primarily to validate, control, manipulate and restrict any unauthorized data access from an already existing SQL database.

Difference between SQL and PL/SQL




Database Language

SQL is a structured query type of database language.

PL/SQL is a type of database programming language and it uses SQL.


SQL is a declarative type of language.

PL/SQL is a procedural type of language.


In the case of SQL, the query performs only one operation.

In the case of PL/SQL, you will find blocks to perform groups of operations in one block.


Users in SQL may execute only one command or query at a particular time.

PL/SQL allows users to execute a complete block consists of codes at a particular time.

Write Options

In SQL, one can use DML and DDL statements to write both queries and commands.

In PL/SQL, one can write code blocks, which contain functions, procedures, variables and packages.


You may add, modify, retrieve, manipulate or delete any data present in your database in case of SQL.

By using PL/SQL, you may create server pages or applications, which display the details you get from SQL in a specific format.


SQL interacts directly with a particular database server.

PL/SQL fails to interact with any database server.