Seeking help w/ summary report: group_by and subqueries

Question

Hi Folks,
I've been asked to produce a report that shows, for each line of business, the number of projects, and number of submitted charters and I am having difficulty getting my head around this.
Here are the tables with pertinent fields:
Table: E_PROGRAM
Fields:
ID (Primary Key)
Program_Number
Cost_Center (Foreign Key to E_COST_CENTER)
Table: E_PROJECT
Fields:
ID (Primary Key)
Program_ID (Foreign Key to E_PROGRAM)
Table: E_PROJECT_MONTHLY
Fields:
ID(Primary Key)
Project_ID (Foreign Key to E_PROJECT)
Charter_Name
Table: E_COST_CENTER
Cost_Center (Numeric Value)
LOB (Varchar2)
Getting the first part went well. I came up with: select cc.lob, count(pj.id) "# Projects"
from e_program p,e_project pj, e_cost_center cc
where p.id = pj.program_id
and p.cost_center = cc.cost_center
group by cc.lob;So to extend it ag get the # of Charters I tried a subquery: select cc.lob, count(pj.id) "# Projects",
(select count(pjm.id)
from e_project_monthly pjm, e_project pj
where pjm.file_id is not null
and pjm.project_id = pj.id) "# Charters"
from e_program p,e_project pj, e_cost_center cc
where p.id = pj.program_id
and p.cost_center = cc.cost_center
group by cc.lob;The result is the LOB, Correct number of Projects for the LOB and the total number of Charters for all LOBs.      # Projects # Charters
LOB1     35     40
ALL      111     40
LOB3     30     40
LOB4     4     40
LOB5     4     40
LOB2     38     40How can I get the subquery tied into to the main query?
Thanks so much for your help and time.
Petie

Answer 1

try this... this would work... i dont know how much data u have in these tables, hence, havent thought much about performance...
select pr.lob, pr.projects '# Projects' ch.charters '# Charters'
from
(select cc.lob lob, count(pj.id) Projects
from e_program p,e_project pj, e_cost_center cc
where p.id = pj.program_id
and p.cost_center = cc.cost_center
group by cc.lob) pr,
(select cc.lob lob, count(pjm.id) charters
from e_project_monthly pjm, e_project pj, e_program p, e_cost_center cc
where pjm.file_id is not null
and pjm.project_id = pj.id
and pj.id = p.id
and p.cost_center = cc.cost_center
group by cc.lob) ch
where pr.lob = ch.lob
Thanks