Query Question: Sum of master and monthly table data

Question

Hi All,
I have two tables that store financial data about programs. The PROGRAM table has the following columns (for purposes of this discussion):
ID, INITIAL_BUDGET, COST_CENTER
The PROGRAM_MONTHLY table has the following (abbreviated list of) columns:
ID, PROGRAM_ID (FK to PROGRAM.ID), CURRENT_FORECAST, RECORD_DATE
Every month, a copy of the program_monthly records for last month is made to new records in the PROGRAM_MONTHLY table and we use RECORD_DATE for our filters and comparisons. This way we have historical data, plus current month data that can be updated by our financial systems and program managers.
I am using Application Express and would like to create a dashboard chart that shows the summary of the INITIAL_BUDGET and the CURRENT_FORECAST for a selected month. Obviously, the INITAL_BUDGET doesn't change, but the CURRENT_FORECAST (and similar columns such as the amount committed to purchase orders, which were omitted to simplify the discussion) change monthly.
My goal is to create a chart that can display the initial budget, current forecast, amount committed on purchase orders, etc. for all cost centers, or just one at a time as the user requires, that is filtered by the month of the PROJECT_MONTHLY record. If I can come up with the statement for a view or query, then I can manage the rest.
The required syntax for the chart is "SELECT link, label, value FROM...", where "link" can be NULL, since is it an optional link to another URL. The "label" and "value" portion are the important parts.
For example, I have another chart that shows the project status (which is a Varchar 2 constrained to values such as, Active, On-Hold, Completed, etc.) with the status as the label and the count of the rows as the value. It starts:
select null link, pjm.PROJECT_STATUS label, COUNT(pjm.ID) value FROM ... However, I have been unable to come up with a query that generates the desired results for these PROGRAM and PROGRAM_MONTHLY tables. I have played with various types of joins and sub-queries, but my SQL just isn't up to the challenge yet. I realize that I might have to re-work the table structure to accomodate this requirement.
I would greatly appreciate any guidance in approaching this problem.
Many thanks for your time and help,
Petie

Answer 1

Certainly, Warren, thanks so much for your willingness to look at my problem.
To keep things simple, I will put the fundamentals of the tables with sample data. Please let me know if you would like more and I would be happy to provide it.
Table: PROGRAM
ID   PROGRAM_NUMBER   INITIAL_BUDGET   COST_CENTER
1   10001            100000           500-001
2   10002            125000           500-001
3   10003            150000           500-002
4   10004            175000           500-002
5   10005             10000           500-003
6   10006            200000           500-004Table: PROGRAM_MONTHLY
ID   PROGRAM_ID   CURRENT_FORECAST  RECORD_DATE
1    1            95000            02-FEB-06
2    2           125000            02-FEB-06
3    3           145000            02-FEB-06
4    4           180000            02-FEB-06
5    5             9000            02-FEB-06
6    6           225000            02-FEB-06
7    1            97500            02-MAR-06
8    2           120000            02-MAR-06
9    3           145000            02-MAR-06
10    4           185000            02-MAR-06
11    5            10000            02-MAR-06
12    6           215000            02-MAR-06
Report Example 1
When a user would like to see the current summary data for all cost centers, they would see a chart with the following data:
INIT_BUDGET  CURRENT_FORECAST
760000       772500
Report Example 2
When a user would like to see the summary data for all cost centers for last month, they would see a chart with the following data:
INIT_BUDGET  CURRENT_FORECAST
760000       779000
Report Example 3
When a user would like to see the current summary data for cost center 500-001, they would see a chart with this following data:
INIT_BUDGET  CURRENT_FORECAST
225000       220000I hope this better illustrates the solution I seek.
Thank you again for your time and assistance
Petie