Database Concepts by David Kroenke, David Auer, Scott Vandenberg, Roberd
Yoder (an old edition is fine)
SQL for Data Science by Antonio Badia
w3schools page on SQL
MySQL Documentation
w3resource page on MySQL
The course notes and other course content were primarily authored by Adina Crainiceanu and Jeff Kenney, with contributions by Taylor Paul, Justin Downs, and Gavin Taylor.