PL/SQL :: Have A Function In Oracle To Select Not Null Columns At Beginning

I have 8 columns. Some of them might be null.I want to display all 8 columns in my result. Not null columns will be first and null at the end.

Here is a sample data :

Employee table :
Employee_id   Emp_fname  emp_lname  emp_mname  dept salary emp_height  emp_weight
   1               aaa        ddd                d1   100      6           180
   2               bbb                ccc             120                 169
   3               dfe                           d2            5.9         223

The expected result is :
result1 result2   result3 result4  result5  result6 result7 result8
1        aaa        ddd     d1       100     6        180
2        bbb        ccc     120      169
3        dfe        d2      5.9      223