What is SQL ?

SQL is called is a Structured Query language which mainly deals with a relational database

What is SQL ?


SQL, in full structured query language, computer language designed for eliciting information from databases. SQL works by providing a way for programmers and other computer users to get desired information from a database using something resembling normal English. On the simplest level, SQL consists of only a few commands: Select, which grabs data; Insert, which adds data to a database; Update, which changes information; and Delete, which deletes information. Other commands exist to create, modify, and administer databases.

SQL is used in everything from government databases to e-commerce sites on the Internet. As the popularity of SQL grew, programmers and computer scientists continued to optimize the way that relational databases work.

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What is SQL used for?

Here are important reasons for using SQL

  • It helps users to access data in the RDBMS system.
  • It helps you to describe the data.
  • It allows you to define the data in a database and manipulate that specific data.
  • With the help of SQL, you can create and drop databases and tables.
  • SQL offers you to use the function in a database, create a view, and stored procedure.
  • You can set permissions on tables, procedures, and views.


Types of SQL Statements

Here are five types of widely used SQL queries.

  • Data Definition Language (DDL)
  • Data Manipulation Language (DML)
  • Data Control Language (DCL)
  • Transaction Control Language (TCL)
  • Data Query Language (DQL)



What are the prerequisites for learning SQL?

Here are prerequisites for learning SQL:

  • Prior programming experience
  • Basics knowledge of working of databases
  • Able to install MySQL database
  • Powerful Language: SQL Queries can be used to retrieve large amounts of records from a database quickly and efficiently.
    SQL joins two or more tables and show it as one table to user.
    • Easy to learn: It is easy to use because it is like the structured English language so it does not need any coding.
    • Portability: SQL can be used in the programs in servers, laptops, PCs, and even some of the mobile phones.
    • Multiple data views: With the SQL language, each user can have different view from each other.
    • Client/Server language: SQL is used for linking end computers and databases. Thus, providing client server architecture.


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