Q.No.5.

Write the SQL queries of following questions:

1. Write a query to display all departments no, which have more-than 2 instructors without using Join or Sub Queries.
2. Write a query to display instructors who have taught course which course id starts except "CS-4".
3. Write a query using Joins to display 2nd lowest salary of instructor using Join.
4. Write a query using Joins to display first name, age and department name of youngest instructor's from each department. Using Join