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These extra problems are not submitted for feedback or grading, but we highly recommend that you work through some of them to help cement your understanding of the material.
In case you're in the mood for more relational algebra beyond the quiz and the interactive workbench exercises (or you found the syntax required by the workbench exercises annoying), we've compiled an extra set of Relational Algebra Exercises to be worked in writing. Answers are provided, but they are hidden until you press the "Show Answers" button. Additionally, relational algebra is a core topic in every database course, and every textbook includes many examples and exercises. Visit the Readings page for a list of recommended textbooks.