SELECT employees.first_name, employees.last_name,
replace(replace(first_name,'l',''),'i'),
initcap(substr(rpad(employees.first_name,6,'_'),1,6)) || '-' ||

case when length(employees.last_name)>4
then lower(substr(employees.last_name,-5,4))
else lower(substr(lpad(employees.last_name,5,'_'),-5,4)) end ||
upper(substr(employees.last_name,-1,1)) code

FROM employees
ORDER BY last_name, first_name;

select first_name, last_name, f
       ||'-'
       ||substr(l, 1, length(l) - 1)
       ||upper(substr(l, -1)) code
  from (select first_name, last_name,
               initcap(rpad(substr(translate(first_name, 'xil', 'x'), 1, 6), 6,
                       '_')) f,
               lpad(substr(translate(last_name, 'xil', 'x'),
                           greatest(-6, -length(translate(last_name, 'xil', 'x')))), 6,
                          '_')
                          l
          from employees);

SELECT ENAME,
       JOB,
          INITCAP (RPAD (REPLACE (REPLACE (ENAME, 'I'), 'i'), 6, '_'))
       || '-'
       || LPAD (
             reverse (
                INITCAP (
                   SUBSTR (reverse ( (REPLACE (REPLACE (JOB, 'I'), 'i'))),
                           1,
                           6))),
             6,
             '_')
          code
  FROM emp
  ORDER BY JOB, Ename

SELECT e."First_Name", e."Last_Name",
       initcap(rpad(replace(replace(e."First_Name", 'l'), 'i'),6,'_'))
       || '-' ||
       reverse(initcap(reverse(lpad(replace(replace(e."Last_Name", 'l'), 'i'),6,'_')))) "Code"
FROM Employees e
ORDER BY e."Last_Name", e."First_Name";