Introduction to MySQL and SQL for Absolute Beginners or as Quick Refresher

The database management system (DBMS) becomes extremely more important in the data era. MySQL is an open source software as relational database management system (RDBMS). It can be freely downloaded here. The instructions for installations, testing, and simple operations are provided here. And more SQL commands can be found on the website of SQLCourse, which is also an interactive online SQL training platform.