What is SQL?

What is SQL?



SQL (Structured Query Language) is used in almost every application or site that interacts with databases. It is a programming language whose sole function is to send queries to relational databases.

A query means an appeal to a database, which is necessary to manage information in it (delete, add or change), carried out using a database management system (DBMS).

The language acts as a kind of intermediary between the database and the project. It allows you to process large amounts of data, receive structured information, as well as administer the DBMS server and edit tables.

SQL consists of a set of statements, divided into groups, each of which has its own purpose.

They are as follows:

  • DML – data manipulation operators for managing the content of the database and extracting information from it;
  • DDL – data description operators for managing database objects;
  • TCL – transaction management language;
  • DCL is a group of data access definition operators.

Some of the most popular relational databases are MySQL, Oracle Database, PostgreSQL, and MS SQL Server. SQL is standardized, but each has its own flavors of the language, called dialects.

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