Скачать или смотреть Introductory SQL Exercises - Structured Query Language

SQL stands for Structured Query Language. It is a domain-specific programming language designed for managing and manipulating relational databases. SQL is used to communicate with and manage data in a relational database management system (RDBMS). RDBMS software, such as MySQL, PostgreSQL, Microsoft SQL Server, and Oracle, uses SQL as its standard language.

SQL provides a set of commands and syntax for performing tasks such as:

Querying data: Retrieving specific information from a database using SELECT statements.

Updating data: Modifying existing records in a database using UPDATE statements.

Inserting data: Adding new records to a database using INSERT statements.

Deleting data: Removing records from a database using DELETE statements.

Creating and modifying tables: Defining the structure of a database, including tables, columns, and constraints, using CREATE and ALTER statements.

Managing database schema: Defining relationships between tables, setting up constraints, and ensuring data integrity.

Controlling access: Granting or revoking permissions to users and roles for various database operations.

SQL is a powerful and standardized language, making it widely used for interacting with relational databases in various applications and industries.