Case not working with aggreate function

Question

i a writing the these SQL lines which is basically alternative approach of pivot keyword using in SQL Server
2005
but here i am using CASE statement if DateNumber exists then give count of ParticulersCount otherwise null
select Particulers
,sum(case when DateNumber=1
then ParticulersCount else NULL end )1
,sum(case when DateNumber=2
then ParticulersCount else NULL end)2
,sum(ParticulersCount) Total
from GTT_OUTPAT
group by Particulers;
Error
SQL Error: ORA-00923: FROM keyword not found where expected
00923. 00000 - "FROM keyword not found where expected"
*Cause:   
*Action:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           

Answer 1

Hi,
If you want identifiers to be named 1 and 2, you need to enclose them in double quotes:
select Particulers
      ,sum(case when DateNumber=1
                then ParticulersCount
                else NULL end) "1"
      ,sum(case when DateNumber=2
                then ParticulersCount
                else NULL end) "2"
      ,sum(ParticulersCount) Total
from GTT_OUTPAT
group by Particulers;Regards
Peter