Oracle SUM function not working in Select clause - oracle

Question

I have the attached code below in which the sum(slice) column is giving me same results even if I don't use the SUM function. Can somebody help me fix the code?
Also need the following:
Currently, it is giving output as:
Task Name Resource ID Slice Date Slice Hours
abc 123 4/1 8.50
abc 123 4/2 7.50
abc 123 4/3 8.50
I need output as:
Task Name Resource ID Slice Date Slice Hours
abc 123 4/1 – 4/30 <Total for the month>
xyz 123 4/1 – 4/30 <Total for the month>
select distinct PCF.project_code as project_id,
PCF.project_name as project_name,
RCF.resource_id,
RCF.last_name || ' ' || RCF.first_name as resource_name,
Tsh.slice_date as fact_date,
sum(tsh.slice) "Total Slice",
T.prname as TaskName,
task_info.phase_code as phase_code,
task_info.phase_name as phase_name,
task_info.task_sequence as task_outline
from prj_blb_slicerequests tsr
JOIN prj_blb_slices tsh ON tsr.id = tsh.slice_request_id
JOIN prtimeentry TE ON tsh.prj_object_id = te.prid
JOIN prtimesheet TS ON TS.prid = TE.prtimesheetid
JOIN prAssignment A ON TE.prassignmentid = A.prid
JOIN prtask T ON A.prtaskid = T.prid
JOIN nbi_resource_current_facts RCF ON TS.prresourceid = RCF.resource_id
JOIN nbi_project_current_facts PCF ON T.prprojectid = PCF.project_id
JOIN prj_projects PP ON PCF.project_id = PP.prid
JOIN (select task_id, phase_code, phase_name, task_name, task_sequence from cust_phase_rollup_v) task_info ON T.prid = task_info.task_id
where tsr.request_name = 'Daily Timeentry Actuals'
and tsh.slice > 0
and ts.prstatus < 5
and tsh.slice_date >= to_date('1-MAY-14')
and tsh.slice_date <= to_date('31-MAY-14')
group by project_code, project_name, resource_id, RCF.last_name || ' ' || RCF.first_name, Tsh.slice_date, T.prname, task_info.phase_code,
task_info.phase_name, task_info.task_sequence
order by project_id

Answer 1

2 problems:
You want results per month, not per day, so instead of just selecting the slice_date, you should convert that into month/year format.
To use an aggregate function, you need a corresponding group by in your query. You should group by all of the other columns you're selecting.
This should work (untested, though):
select distinct PCF.project_code as project_id,
PCF.project_name as project_name,
RCF.resource_id,
RCF.last_name || ' ' || RCF.first_name as resource_name,
to_char(Tsh.slice_date, 'mm/yyyy') as fact_date,
sum(tsh.slice) "Total Slice",
T.prname as TaskName,
task_info.phase_code as phase_code,
task_info.phase_name as phase_name,
task_info.task_sequence as task_outline
from prj_blb_slicerequests tsr
JOIN prj_blb_slices tsh ON tsr.id = tsh.slice_request_id
JOIN prtimeentry TE ON tsh.prj_object_id = te.prid
JOIN prtimesheet TS ON TS.prid = TE.prtimesheetid
JOIN prAssignment A ON TE.prassignmentid = A.prid
JOIN prtask T ON A.prtaskid = T.prid
JOIN nbi_resource_current_facts RCF ON TS.prresourceid = RCF.resource_id
JOIN nbi_project_current_facts PCF ON T.prprojectid = PCF.project_id
JOIN prj_projects PP ON PCF.project_id = PP.prid
JOIN (select task_id, phase_code, phase_name, task_name, task_sequence from cust_phase_rollup_v) task_info ON T.prid = task_info.task_id
where tsr.request_name = 'Daily Timeentry Actuals'
and tsh.slice > 0
and ts.prstatus < 5
and tsh.slice_date >= to_date('1-MAY-14')
and tsh.slice_date <= to_date('31-MAY-14')
group by PCF.project_code,
PCF.project_name,
RCF.resource_id,
RCF.last_name || ' ' || RCF.first_name,
to_char(Tsh.slice_date, 'mm/yyyy'),
T.prname,
task_info.phase_code,
task_info.phase_name,
task_info.task_sequence
order by PCF.project_code