Exercises on university database: Submit SQl queries for following statements.

1. Find the names of courses in Computer science department which have 3 credits

2. For the student with ID 12345 (or any other value), show all course_id and title of all courses registered for by the student.

3. Find the names of all students who have taken any Comp. Sci. course ever (there should be no duplicate names) 4. Display the IDs of all instructors who have never taught a couse.

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