SQL  Structured Query Language is a special purpose language designed for managing data held in a relational database management system (RDBMS), or for stream processing in a relational data stream management system (RDSMS).
Originally based upon relational algebra and tuple relational calculus, SQL consists of a data definition language, data manipulation language, and Data Control Language.

The scope of SQL includes data insert, query, update and delete , schema creation and modification, and data access control. Although SQL is often described as, and to a great extent is, a declarative language , it also includes procedural elements.

SQL Basics pdf

Learn SQL from W3School

Learn SQL from CodeCademy

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