Believe it or not, I figured out how to do this in "Configurable_Reports". Here's what it looks like:
SELECT prefix_course.shortname Name, prefix_quiz.name Quiz,
Count(prefix_quiz_attempts.attempt) Count
FROM prefix_course prefix_course, prefix_quiz prefix_quiz, prefix_quiz_attempts prefix_quiz_attempts
WHERE prefix_course.id = prefix_quiz.course AND prefix_quiz.id = prefix_quiz_attempts.quiz
GROUP BY prefix_quiz.name, prefix_course.shortname ORDER BY prefix_course.shortname
Just in case anybody else needs it someday...