(SQL) Structured Query Language

SQL (Structured Query Language) is a standard language for managing and manipulating relational databases. SQL is used to perform various tasks such as inserting, updating, and retrieving data from a database. Here are some useful resources for learning SQL:

• W3Schools SQL Tutorial: A comprehensive tutorial on SQL, covering the basics and advanced topics.
  https://www.w3schools.com/sql/

• SQLBolt - A beginner's tutorial for SQL: A step-by-step tutorial that helps you learn SQL by examples.
  https://sqlbolt.com/

• SQL Zoo: A series of interactive tutorials that teach you SQL by example.
  http://sqlzoo.net/

• Mode Analytics SQL Tutorial: A comprehensive SQL tutorial that covers SQL concepts and practices.
  https://mode.com/sql-tutorial/

• PostgreSQL Tutorial: A tutorial that covers SQL basics, as well as advanced topics such as stored procedures and transactions.

• http://www.postgresqltutorial.com/

• Oracle SQL Tutorial: A tutorial that covers the basics of SQL as well as advanced topics for Oracle database users.
  https://docs.oracle.com/en/database/oracle/oracle-database/19/lnpls/index.html

• SQLBook.com: A website that provides interactive SQL tutorials and exercises to help you learn SQL.
  http://sqlbook.com/

These resources should give you a good starting point for learning SQL. With practice, you'll become proficient in SQL and be able to use it to manipulate and manage databases.