SQL: Applications, Uses, and Commands

  • Riya Kumari
  • Sep 08, 2020
  • SQL
SQL: Applications, Uses, and Commands title banner

The Internet is playing a very vital role in our day to day life, there are different terms which are still unknown to numerous people. So, in this blog, we are going to discuss one of the computer languages that is 'SQL'. It stands for Structured Query Language. 

 

As you can recall whenever you install any mobile or window app or go to the website they demand to first create your account so that they can store all your details in the database and keep them safe in the database. 

 

Now, you must be thinking about why we are talking about the database? This is because the database and SQL are related to each other as SQL is the system that manages the database. Thus, the reason behind your data is safely stored somewhere is only because of SQL who governs the work of the database. It allows you to enter and operate the database. 

 

In 1986, SQL became a norm of the American National Standards Institute (ANSI) and in 1987 of the International Organization for Standardization (ISO). There are different applications, uses, and commands of SQL. In this blog, you will get to know in detail about all these aspects. 

 

 

What is SQL (Structured Query Language)?

 

SQL is a computer language that gives orders or instructions to the database. If you want to create a database, store data, update/delete, there are different commands known as SQL. All RDBMS use SQL as standard database language. Now, take the example of Facebook, while making a Facebook account you see a registration form that you have to fill so that after clicking on the submit button all the information filled by you has been stored in the database. (Read to know in detail: SQL for Data Scientists Parts- 1 )

 

But how will this work? So the answer is when you click on the submit button then in the backend SQL has already performed its work, it executes a command which instructs the database to store the data. Consequently, communication between registration form and database is in the language of SQL.

 

Despite the fact that SQL is an ANSI/ISO standard, there are various variants of the SQL language. Nonetheless, to be consistent with the ANSI standard, they all help, at any rate, the significant orders, (for example, SELECT, UPDATE, DELETE, INSERT, WHERE) along these lines. (Read for the summary: SQL Tutorial )


 

What are the Uses of SQL?

 

Let's discuss the uses of SQL and through this what are the operations performed related to the database.

 

  • You can create a new database with SQL,

  •  You can insert new data in the database,

  • You can modify or update your previous data,

  • You can retrieve your data from the database,

  • You can delete your data,

  • You can create a new table in one database or even drop the table,

  • You can set permissions for table, procedures and views, and

  •  You can create function, views and stored procedures

Hence, in a database management system, all works are accomplished with the assistance of SQL. (Related article: SQL for Data Scientists Parts- 2)

 

 

What are the Applications of SQL?

 

Here, we will see some applications of SQL that render it so valuable in a data-driven world where governing massive databases is the criterion of the day. 

 

  • SQL is used as a Data Definition Language (DDL) which means you can autonomously make a database, characterize its structure, use it and afterwards dispose of it when you are finished with it. It is additionally conveyed as a Data Control Language (DCL) which determines how you can ensure your information base against debasement and misuse.

  • SQL is used as a Data Manipulation Language (DML) which implies you can use it for keeping up a previously existing database. Hence, it is an incredible language for entering information, changing information, and separating information with respect to a database.

  • It is broadly used as a Client or Server language to interface the front-end with the back-end consequently supporting the customer or worker architecture. Likewise, it can be used in the three-level design of a customer, an application worker, and a database which characterizes the Internet architecture.


 

How SQL works on the website?

 

All the dynamic websites existing on the internet all are database driven. Dynamic sites like online banking, social media sites, railway reservations, e-commerce are connected to the database. If there is a database, SQL will definitely come in handy. However, SQL plays a crucial part but can't do the whole work alone. So, there are several elements that work together and for this, there is a need for some entities.

 

  • RDBMS Database Program (for example MySQL, MS Access, Oracle, SQL Server etc)

  • Server-side scripting (for example ASP, PHS etc)

  • HTML, CSS

  • SQL Commands


This image depicts some important topics, commands and more terms of SQL.

Some commands and topics of SQL


In your server MySQL like RDBMS software has to be installed and after that, through server-side scriptings like PHP and ASP you have to do programming first and then create dynamic web pages. Also, you have to do coding and tell which task perform you want. Now, for the user interface, you have to create pages for HTML and CSS so that you or the user can see the output of the task.


 

What are the SQL Commands?

 

There are some commands of SQL and we can divide these commands according to our work in three categories.

 

  • DDL (Data Definition Language): Under DDL there are three parts- create, alter, and drop. Create is used while creating a new object in the database. Alter is used to modify database objects like tables. Drop is used to deleting an object.

  • DML (Data Manipulation Language): Under DML there are four parts- select, insert, update and delete. Select is to retrieve one or more data from the table. Insert is used to enter a new record. The update is for modifying the record. Delete is for deleting the record.

 

"Blockchain technology represents a generational opportunity to mutualize database infrastructure across entities within financial services. What that translates into an enormous cost-saving, risk-reducing, and capital enhancing opportunity" - Blythe Masters

 

  • DCL (Data Control Language): Under DCL there are two parts- grant and revoke. Grant has the work of giving permission to the users. On the other hand, Revoke has the work of removing the permission.

 

 

What are the Features of SQL?

 

Now, let's discuss some of the features of SQL. It is extremely manageable and simple to learn the language. SQL is flexible as it works with information base frameworks from Oracle, IBM, Microsoft, and so forth. Also, it is an ANSI and ISO standard language for information base creation and control.

 

There are other features moreover like it is quick in recovering a lot of information proficiently. It has a very much characterized structure as it utilizes since quite a while ago settled guidelines and it lets you oversee databases without knowing part of coding.


 

Conclusion

 

So, we can conclude by saying that, today regardless of the relational database frameworks by significant enterprises like Oracle, IBM, Microsoft, and others, the one thing that is normal to them is the SQL. So, on the chances that you learn SQL on the web, at that point, you will have the option to seek after a wide vocation crossing plenty of jobs of obligations. 


Likewise, if you are learning SQL, at that point, it is significant for a data science vocation too since a data researcher will likewise need to manage social data sets and question it utilizing the standard language SQL. The usage and applications of SQL show its significance in the programming language.

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