Trigger code

Question

hai,
i want code for a trigger that dispalys number of working days for employee in a
employee table where startdate and end date are available and should grouped by month.

Answer 1

May be something like this?
ops$mportes@FCCUAT9I> var dtini varchar2(20)
ops$mportes@FCCUAT9I> var dtend varchar2(20)
ops$mportes@FCCUAT9I>
ops$mportes@FCCUAT9I> exec :dtini := '01/01/2006'
PL/SQL procedure successfully completed.
DTINI
01/01/2006
ops$mportes@FCCUAT9I> exec :dtend := '31/12/2006'
PL/SQL procedure successfully completed.
DTEND
31/12/2006
ops$mportes@FCCUAT9I>
ops$mportes@FCCUAT9I> with
  2  d
  3  as ( select to_date(:dtini, 'dd/mm/yyyy') + level-1 dt
  4         from dual
  5      connect by level <= to_date(:dtend, 'dd/mm/yyyy') - to_date(:dtini, 'dd/mm/yyyy')
  6     )
  7  select to_char(dt, 'MON-yyyy') month, count(*) cnt
  8    from d
  9   where to_char(dt, 'd') not in (1, 7) -- you have to put holidays as well
10   group by to_char(dt, 'MON-yyyy')
11  /
MONTH              CNT
APR-2006            20
AUG-2006            23
DEC-2006            21
FEB-2006            20
JAN-2006            22
JUL-2006            21
JUN-2006            22
MAR-2006            23
MAY-2006            23
NOV-2006            22
OCT-2006            22
SEP-2006            21
12 rows selected.