How can i use this expression in DECODE function?

Question

My PNO table formart is
PNO PDate PCount
P001 08/27/05 09:45 20
P001 08/27/05 09:50 10
P002 08/27/05 03:40 20
P003 08/28/05 11:00 20
P003 09/28/05 10:00 20
P003 08/27/05 11:00 10
P003 09/27/05 04:00 50
I want to display total pcount for shift1(morning) and shift2(evening) & the date is 08/27/05
PNO Shift1(08/27/2005 08:00 to 12:30) Shift2(08/27/2005 02:00 to 05:30)
P001 30 0
P002 0 20
P004 10 50
So for shift1 condition is:
pdate>=08/27/2005 08:00 and pdate<=08/27/2005 12:30
So for shift2 condition is:
pdate>=08/27/2005 02:00 and pdate<=08/27/2005 05:30
If i tried to give this expression in decode function , its not working.
Please give me the sql query to solve this problem.
Millions of thanks in advacne

Answer 1

forgot to paste the output for a given date.
SQL> create table pno
  2  (pno    varchar2(32)
  3  ,pdate  date
  4  ,pcount number)
  5  /
Table created.
SQL>
SQL> insert into pno values('P001', to_Date('08/27/05 09:45', 'mm/dd/yy hh:mi') ,20)
  2  /
1 row created.
SQL> insert into pno values('P001', to_Date('08/27/05 09:50', 'mm/dd/yy hh:mi') ,10)
  2  /
1 row created.
SQL> insert into pno values('P002', to_Date('08/27/05 03:40', 'mm/dd/yy hh:mi') ,20)
  2  /
1 row created.
SQL>
SQL> insert into pno values('P003', to_Date('08/28/05 11:00', 'mm/dd/yy hh:mi') ,20)
  2  /
1 row created.
SQL> insert into pno values('P003', to_Date('09/28/05 10:00', 'mm/dd/yy hh:mi') ,20)
  2  /
1 row created.
SQL> insert into pno values('P003', to_Date('08/27/05 11:00', 'mm/dd/yy hh:mi') ,10)
  2  /
1 row created.
SQL> insert into pno values('P003', to_Date('09/27/05 04:00', 'mm/dd/yy hh:mi') ,50)
  2  /
1 row created.
SQL> select pno,sum(pcount) "Morning Shift Count"
  2  from pno
  3  where to_char(pdate, 'mm/dd/yyyy hh:mi') >= '08/27/2005 08:00'
  4    and to_char(pdate, 'mm/dd/yyyy hh:mi') <='08/27/2005 12:30'
  5  group by pno
  6  /
PNO                              Morning Shift Count                           
P001                                              30                           
P003                                              10                           
SQL> select pno,sum(pcount) "Evening Shift Count"
  2  from pno
  3  where to_char(pdate, 'mm/dd/yyyy hh:mi') >= '08/27/2005 02:00'
  4    and to_char(pdate, 'mm/dd/yyyy hh:mi') <='08/27/2005 05:30'
  5  group by pno
  6  /
PNO                              Evening Shift Count                           
P002                                              20