Question: What percentage of students are highly satisfied with the Intro to Database 2 course?
SQL: SELECT CAST(( SELECT COUNT(*) FROM course WHERE name = 'Intro to Database 2' AND course_id IN ( SELECT course_id FROM registration WHERE sat = ( SELECT MAX(sat) FROM registration ) ) ) AS REAL) * 100  / COUNT(T1.student_id) FROM registration AS T1 INNER JOIN course AS T2 ON T1.course_id = T2.course_id WHERE T2.name = 'Intro to Database 2'