empid empname managerid deptid Salary 1 Emp1 0 1 6000 2 Emp2 0 5 6000 3 Emp3 1 1 2000 13 Emp13 2 5 2000 11 Emp11 2 1 2000 9 Emp9 1 5 3000 8 Emp8 3 1 3500 7 Emp7 2 5 NULL 3 Emp3 1 1 2000 In the same table, some … Continue reading SQL Interview Questions | Remove duplicate entries