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Companies and other organizations use SQL programs to access and manipulate the information and data in their databases and to create and modify new tables. To fully understand SQL, you must know exactly what a database is.

According to Microsoft, a database is a tool for collecting and organizing information. Databases can store information about people, products, orders, or anything else. Many databases start with a word processor or spreadsheet. As they grow, many companies find it useful to transfer them to a database created by a database management system.

When should SQL be used?

SQL helps control the information stored in databases and allows users to retrieve the specific data they seek on demand.

Although it is a simple programming language, SQL is very powerful. SQL can insert data into database tables, modify data in existing database tables, and delete data from SQL database tables. In addition, SQL can change the database structure by creating, modifying, and deleting tables and other database objects.

SQL uses a series of commands to manipulate data in databases. Examples include SQL INSERT, used to add data to database tables; SQL SELECT, which retrieves data from database tables; and SQL UPDATE, which modifies existing database records.

With so many companies relying on big data analytics to drive their direction, SQL expertise is one of the most in-demand professional skills.

Instead of writing SQL for their databases, many companies use a database management system with built-in SQL. MySQL, developed and distributed by Oracle, is one of today’s most popular SQL database management systems.

What is MySQL?

MySQL is open source, meaning you can download and use it for free. MySQL is a sophisticated and powerful relational database many websites use to create and modify content quickly.

When is MySQL used?

MySQL can be used for various applications, including data storage, e-commerce and registration. However, it is usually found on web servers.

Examples of widely used MySQL systems

Many of the world’s largest and best-known brands, including Facebook, Google, Adobe, Alcatel-Lucent, and Zappos, rely on MySQL to properly run their websites.

In addition to MySQL, there are other open-source SQL database management systems including PostgreSQL, Ingres and Firebird.

What are SQL commands?SQL

Structured query language (SQL) commands are specific keywords or SQL statements that developers use to manipulate the data stored in a relational database. You can categorize SQL commands as follows.

Data definition language 

Data definition language (DDL) refers to SQL commands that design the database structure. Database engineers use DDL to create and modify database objects based on the business requirements. For example, the database engineer uses the CREATE command to create database objects such as tables, views, and indexes.

Data query language

Data query language (DQL) consists of instructions for retrieving data stored in relational databases. Software applications use the SELECT command to filter and return specific results from a SQL table.

Data manipulation language

Data manipulation language (DML) statements write new information or modify existing records in a relational database. For example, an application uses the INSERT command to store a new record in the database.

Data control language

Database administrators use data control language (DCL) to manage or authorize database access for other users. For example, they can use the GRANT command to permit certain applications to manipulate one or more tables.

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