Slides PDF: http://15445.courses.cs.cmu.edu/fall2017/slides/02-relationalalgebra.pdf
Lecture Notes: http://15445.courses.cs.cmu.edu/fall2017/notes/02-relationalalgebra.pdf
Andy Pavlo (http://www.cs.cmu.edu/~pavlo/)
15-445/645 Intro to Database Systems (Fall 2017)
Carnegie Mellon University
http://15445.courses.cs.cmu.edu/fall2017