clues 1: Get unique DEPARTMENT from employee table
clues 2: Select first 3 characters of FIRST_NAME from EMPLOYEE
clues 3:- Get position of 'o' in name 'John' from employee table
clues 4: Get FIRST_NAME from employee table after removing white spaces from right side
clues 5: Get First Name and Last Name as single column from employee table separated by a '_'