What's the best and free website for learn SQL complete course .Any suggestions please.

Answer 1

https://www.sololearn.com/Course/SQL/
https://academy.vertabelo.com/
https://www.w3schools.com/sql/default.asp
https://www.codecademy.com/learn/learn-sql
FOR MORE:
https://academy.vertabelo.com/blog/18-best-online-resources-for-learning-sql-and-database-concepts/

Answer 2

Thank you xxx