Write the SQL queries of the following questions:

i. Write a query to display all departments no, which have more-than 2 instructors without using Join or Sub Queries.

ii. Write a query to display instructors who have taught courses in which course id starts except "CS-4".

iii. Write a query using Joins to display the 2nd lowest salary of the instructor using Join.

iv. Write a query using Joins to display the first name, age and department name of the youngest instructor's from each department. Using Join

Note: its just a paper question no database schema is build so you can answer just basic queries, not for specific database schema