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SQL Tutorial

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SQL is a standard database language used to access and manipulate data in databases. SQL stands for Structured Query Language. SQL was developed by IBM Computer Scientists in the 1970s. By executing queries SQL can create, update, delete, and retrieve data in databases like MySQL, Oracle, PostgreSQL, etc. Overall SQL is a query language that communicates with databases.

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In this SQL tutorial, you’ll learn all the basic to advanced concepts like SQL queries, SQL join, SQL injection, SQL insert, and creating tables in SQL. SQL is easy to learn, there are no prerequisites to learning SQL.

What is a Database?

Before taking a deep dive into this free SQL tutorial let’s understand what is database?

So, data is the new fuel of this world but data is unorganized information, so to organize that data we make a database. A database is the organized collection of structured data usually controlled by a database management system (DBMS). Databases help us easily store, access, and manipulate data held on a computer.

‘Recent Articles’ on SQL

SQL Basics

Create Database in SQL

Tables in SQL

SQL Queries

SQL Clauses

SQL Operators

SQL Aggregate Functions

SQL Data Constraints

SQL Joining Data

SQL Functions

SQL Views

SQL Indexes

SQL Miscellaneous Topics

Why to learn SQL?

SQL helps you to easily get information from data at high efficiency. To manipulate the data in databases like Create, Read, Edit, and delete we use SQL queries. Users can interact with data stored in relational database management systems. Anyone who knows the English language can easily write SQL queries. Some of the key features of SQL are given below:

  • Without a lot of coding knowledge, we can manage a 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 amounts of data very fast.

Applications of SQL

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

  • To support client/server architecture, software engineers use 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 a database.
  • SQL is used as a Data Definition Language(DDL) in which we can independently create a database, define the 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, modify data, and extract data.
  • SQL is used as a Data Control Language(DCL) it specifies how we can protect our database against corruption and misuse.

Pre-requisites to learn SQL

This free SQL tutorial is quite easy to understand because, during the development of this course, we tried our best to provide the best resource to clear your SQL concept.

But we assume that you are already aware of the basic conceptions of computer science, like databases and its types.

So, if you have basic knowledge of RDBMS, then this SQL tutorial provides you with enough knowledge to master SQL.

SQL Online Quiz

Start your Online SQL Quiz

SQL Jobs and Opportunities

There are numerous companies around the globe seeking SQL professionals, and they pay high packages. The average salary of SQL developers is around 40,000 to 65,000 INR. In this section, we have listed some of the top giant companies that hire SQL experts.

Advantages of SQL

SQL or Structured Query Language, is one of the most popular query languages in the field of data science. SQL is the perfect query language that allows data professionals and developers to communicate with their databases.

In the below section, we have listed some of the most prominent advantages or benefits of Structured Query Language:

  • Simple and Easy to Learn – Most of the commands and syntax in SQL are like normal English, which makes SQL easy to learn. Along with this, SQL follows a logical structure that helps promote readability and understanding.
  • Efficiency and Speed Execution – Well, SQL is optimized for RDBMS, which means relational database, and this thing ensures fast query execution.
  • Standardization – SQL is a widely accepted standard query language and ensures compatibility across different database systems.
  • Scalable – SQL can efficiently manage massive datasets, accommodating growth without compromising performance.

Frequently Asked Questions About SQL

1. What are the types of SQL?

There are 5 types of SQL of commands DDL (Data Definition Language), DML (Data Manipulation Language), DCL, (Data Control Language), TCL (Transaction Control Language), DQL (Data Query Language)

2. How do I start learning SQL?

Well, if you want to start learning SQL, then first you have to set your goals, and after that, you have to find the resource from which you can easily learn SQL. After that, you have to do the regular practice to upscale your skills.

3. What are the basic commands of SQL?

The basic commands of SQL are UPDATE, SELECT, INSERT, and DELETE.

4. What are data types in SQL?

SQL has String Data Type, Numeric Data Type, Date and time Data Type.

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.



Last Updated : 15 Feb, 2024
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