SQL (Structured Query Language) is a programming language used to communicate with and manipulate databases. It is used to store, retrieve, manage, and manipulate data within a database management system. SQL is the most commonly used database language, so it can be used for almost any company that needs to store relational data. SQL is used on websites for back-end data storage and data processing solutions. It is used in marketing, healthcare, and finance for data and business analytics, development, and data science. SQL is used to manipulate and analyze patient information stored in clinical databases. Developers use SQL when building mobile and web applications that require access to databases.

SQL allows end-users to communicate with databases and perform tasks like creating, updating, and deleting databases. SQL queries are used to retrieve data from the database, but the queries vary in efficiency. SQL provides CRUD functionality for databases. SQL uses a set of commands to manipulate the data in databases, such as SQL INSERT, which is used to add data to database tables, SQL SELECT, which retrieves data from database tables, and SQL UPDATE, which modifies existing database records.

SQL is used by almost every mid to large-sized organization, including Facebook, Microsoft, LinkedIn, and Accenture. Other companies that use SQL include Spotify, Revolut, Twitter, and Instagram. MySQL is the most commonly used version of SQL, and it is an open-source solution that helps facilitate SQL’s role in managing back-end data for web applications.

In summary, SQL is used for:

• Storing, retrieving, managing, and manipulating data within a database management system
• Back-end data storage and data processing solutions on websites
• Marketing, healthcare, and finance for data and business analytics, development, and data science
• Manipulating and analyzing patient information stored in clinical databases
• Building mobile and web applications that require access to databases
• Almost every mid to large-sized organization, including Facebook, Microsoft, LinkedIn, and Accenture
• Other companies such as Spotify, Revolut, Twitter, and Instagram.