Find the personal name, family name, and author ID of the course author that teaches the most courses.
create table courses (author_id varchar, PRIMARY KEY (author_id)); create table course_authors_and_tutors (personal_name varchar, family_name varchar, author_id varchar, PRIMARY KEY (personal_name))
select t1.personal_name, t1.family_name, t2.author_id from course_authors_and_tutors as t1 join courses as t2 on t1.author_id = t2.author_id group by t2.author_id order by count(*) desc limit 1