SQL Tutorial

  • Last Updated : 21 Mar, 2023

Structured Query Language or SQL is a standard Database language which is used to create, maintain and retrieve the data from relational databases like MySQL, Oracle, SQL Server, PostGre, etc. The recent ISO standard version of SQL is SQL:2019.

SQL tutorial

As the name suggests, it is used when we have structured data (in the form of tables). All databases that are not relational (or do not use fixed structure tables to store data) and therefore do not use SQL, are called NoSQL databases. Examples of NoSQL are MongoDB, DynamoDB, Cassandra, etc.

In this SQL tutorial, you’ll get to learn SQL from basic to advanced level in an easy & organized manner.

‘Recent Articles’ on SQL


SQL Basics:

SQL Clauses / Operators:


SQL Functions:

SQL Queries:



SQL Server:


Why We Use SQL ?

The data is only an unorganized information, so to organize that data we make database. Database is the organized collection of structured data which is usually controlled by a database management system(DBMS) so, to manipulate the data in database e.g. Create, Read, Edit, Delete we use SQL. User can interact with data stored in relational database management systems.

SQL is easy to learn, there is no prerequisites to learn SQL. Anyone who know English language can easily write SQL queries.

Features of SQL

  • Without lot of coding knowledge we can manage database with SQL.
  • SQL works with database systems from Oracle, IBM, Microsoft, etc.
  • Simple and easy to learn.
  • SQL is ANSI and ISO standard language for database manipulations.
  • SQL retrieves large amount of data very fast.

Applications of SQL

In data driven industries where managing databases is very important in regular, Here are some SQL important applications.

  • To support client/server architecture, software engineers uses SQL to establish the connection between back-end and front-end.
  • SQL can also be used in the 3-tier architecture of a client, an application server and database.
  • SQL is used as a Data Definition Language(DDL) in which we can independently create a database, define structure, use it and discard it when its work is done.
  • SQL is used as a Data Manipulation Language(DML) in which we can enter data, modifying data, extracting data.
  • SQL is used as a Data Control Language(DCL) it specifies how we can protect our database against corruption and misuse.

Quick Links:

If you’re looking out for a worthwhile and reliable SQL tutorial for beginners, (or experts as well), then you must go through with this resource. Also, here you’ll get SQL interview questions, exercises, examples, etc.

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