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What’s SQL? Database Definition for Freshmen

by Icecream
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Information is a robust instrument that drives all the things you see and work together with on the web.

It facilitates analysis and powers at the moment’s know-how. It’s the driving pressure behind at the moment’s synthetic intelligence and robotics. And a lot extra.

Beforehand, these information had been saved on paper, in bodily recordsdata inside cupboards. However now they’re saved on-line in what is named a database.

On this article, you’ll find out about what a database is, the 2 main forms of databases, after which what SQL is and why it is necessary.

What’s a Database?

A database is a structured assortment of electronically saved information. These information may be accessed, managed, modified, up to date, managed, and arranged with the assistance of a database administration system (DBMS).

Information and DBMS are usually linked and known as a database system, often shortened to only a database.

There are a number of forms of databases, relying on how information is saved, retrieved, and modified. However there are two main sorts, that are relational and non-relational databases.

What’s a Relational Database?

A relational database, often known as a SQL database, is used to retailer information in tables. Which means the information is organized into rows and columns.

This kind of database organizes information in predefined relationships and shops that information in a number of tables of columns and rows. This makes it simple to see and perceive how totally different information buildings relate to 1 one other.


This kind of database is known as “relational” as a result of two or extra tables could also be associated to one another.

For instance, when you have got a desk of customers with a novel id, you should use that id to retailer every person’s order in a distinct order desk and request them utilizing the person’s distinctive id.


Widespread examples of relational database administration techniques are MySQL, PostgreSQL, MSSQL, and Oracle. To entry information from relational databases, you’ll use SQL (Structured Question Language).

What’s a Non-Relational Database?

Non-Relational Databases, often known as NoSQL Databases, are databases that retailer information in a non-tabular format.

Which means information shouldn’t be modelled in rows and columns however slightly in key-value pairs. For instance, in key-value pairs, you possibly can have objects representing every person:


Examples of non-relational databases are MongoDB, Amazon DynamoDB, Redis, and plenty extra.

What’s SQL?

Structured Question Language (SQL) is a question language used with relational databases comparable to MySQL, Oracle, MSSQL, PostgreSQL, and lots of others.

It’s a question language that you should use to create and delete databases and tables, insert and browse information into tables, delete information from tables, and way more.


For instance, as an instance that you’ve got a desk of customers, as seen above, that holds the distinctive id, first identify, final identify, and age. You should use SQL to learn or get particular information from the desk, comparable to the primary and final names solely:

SELECT first_name, last_name FROM Customers;

It will return a desk with solely the queried information:


You are able to do much more with SQL, however this was simply an introduction. If you wish to be taught extra, I’ve linked a pair nice assets beneath.

That is it!

On this article, you have got discovered the elemental and main variations between relational and non-relational databases. You additionally discovered that SQL is a question language used with relational databases to work together with the database.

There’s extra to what you are able to do with SQL and databases. You’ll be able to be taught extra about SQL and databases by watching the most effective movies on the web, with over 14 million views. You can too take a look at over 120 articles on SQL revealed on the freeCodeCamp publication.

Have enjoyable coding!

You’ll be able to entry over 150 of my articles by visiting my web site. You can too use the search area to see if I’ve written a selected article.

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