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SQL Tutorial

Introduction

In this SQL tutorial you will learn SQL to get a clear idea of what Structured Query Language is and how you deploy SQL to work with a relational database system. So a structured query language is a language that is used to operate the relational databases. Some of the major ways in which SQL is used in conjunction with a relational database is for the purposes of storing, retrieving and manipulating of data stored in a relational database.

Recommended audience

This SQL tutorial can be beneficial to anybody who wants to learn SQL. Software developers, database administrators, architects, managers can take this SQL tutorial as a first step to learn SQL and excel in their careers.

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Prerequisites

There are no prerequisites to learn SQL from this SQL tutorial. If you have a basic understanding computer languages and databases, then it is beneficial.

What is SQL?

To learn SQL, first let us compare SQL with NoSQL in the below table:

Comparison criteria SQL NoSQL
Type of database Relational Non-relational
How is data stored Structured data in tables Unstructured data in JSON files
Suitability for OLTP systems Excellent Average
Database compliance ACID properties CAP Theorem

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The language to communicate with the relational database is the SQL or Structured Query Language. SQL helps to operate the relational databases and derive information from it. Some of the operations that the SQL does include creation of database, fetching, modifying, updating and deleting the rows along with storing, manipulating and retrieving data within the relational database. SQL is an ANSI standard language but there are a lot of versions of SQL in usage as well.

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Why is SQL so widely used?

Structured Query Language or SQL is used so extensively for the following reasons.

  • SQL lets you access any data within the relational database
  • You can describe the data in the database using SQL
  • Using SQL you can manipulate the data with the relational database
  • SQL can embed within other languages through SQL modules & libraries
  • SQL lets you easily create and drop databases and tables
  • SQL allows you to create views, functions and stored procedures in databases
  • Using SQL you can set permissions on procedures, tables and views.

Features of SQL

Here in this section of the SQL tutorial we list some of the top features of SQL that make it so ubiquitous when it comes to managing relational databases.

  • SQL is very simple and easy to learn language
  • SQL is versatile as it works with database systems from Oracle, IBM, Microsoft, etc.
  • SQL is an ANSI and ISO standard language for database creation and manipulation
  • SQL has a well-defined structure as it uses long established standards
  • SQL is very fast in retrieving large amounts of data very efficiently
  • SQL lets you manage databases without knowing lot of coding.
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Applications of SQL

Here in this section of the SQL tutorial we will learn SQL applications that make it so important in a data-driven world where managing huge databases is the norm of the day.

  • SQL is used as a Data Definition Language (DDL) meaning you can independently create a database, define its structure, use it and then discard it when you are done with it
  • SQL is also used as a Data Manipulation Language (DML) which means you can use it for maintaining an already existing database. SQL is a powerful language for entering data, modifying data and extracting data with regard to a database
  • SQL is also deployed as a Data Control Language (DCL) which specifies how you can protect your database against corruption and misuse.
  • SQL is extensively used as a Client/Server language to connect the front-end with the back-end thus supporting the client/server architecture
  • SQL can also be used in the three-tier architecture of a client, an application server and a database which defines the Internet architecture.

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Why should you learn SQL?

Today regardless of the relational databases systems by major corporations like Oracle, IBM, Microsoft and others, the one thing that is common to them is the Structured Query Language or SQL. So if you learn SQL then you will be able to pursue a very broad career spanning a lot of roles of responsibilities. Also if you learn SQL then it is important for a data science career as well since a data scientist will also have to deal with relational databases and query it using the standard language SQL.

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