A college contains many departments. Each department can offer any number of courses. Many instructors can work in a department but an instructor can work only in one department. For each department...

A college contains many departments. Each department can offer any number of courses. Many instructors can work in a department but an instructor can work only in one department. For each department there is a head and an instructor can be head of only one department. Each instructor can take any number of courses and a course can be taken by only one instructor. A student can enroll for any number of courses and each course can have any number of students.

Please construct at least 20 queries using the RA, TRC, and DRC as the examples to query your database