Procedure help

Question

Hi there,
I am trying to write a procedure which calculates the remaining time from two different tables. The problem hereby is that one table (TBL_TIMESHEET) has the total for each day whereas the total for each day from the other table (TBL_COSTING) is calculated on the fly.
The query to get the all 7 days for one period is
SELECT
DAY_DATE,
TIMESHEET_DATA.calculate_hours_project(HOURS_TOTAL) HOURS_TOTAL,
TO_CHAR(DAY_DATE, 'yyyymmdd') DAY_ORDER_BY
FROM TBL_TIMESHEET
where USER_ID = in_user_id
AND PERIOD = in_period          
ORDER BY DAY_ORDER_BY ASC;
to get the hours from TBL_COSTING 7 days for one period is
SELECT
SUM(timesheet_data.calculate_hours_project(HOURS_THU)) HOURS_THU,
SUM(timesheet_data.calculate_hours_project(HOURS_FRI)) HOURS_FRI,
SUM(timesheet_data.calculate_hours_project(HOURS_SAT)) HOURS_SAT,
SUM(timesheet_data.calculate_hours_project(HOURS_SUN)) HOURS_SUN,
SUM(timesheet_data.calculate_hours_project(HOURS_MON)) HOURS_MON,
SUM(timesheet_data.calculate_hours_project(HOURS_TUE)) HOURS_TUE,
SUM(timesheet_data.calculate_hours_project(HOURS_WED)) HOURS_WED
FROM TBL_COSTING
WHERE USER_ID = in_user_id
AND PERIOD = in_period;
The problem now is that I need to subtract the value of the returned seven days of HOURS_TOTAL from table TBL_TIMESHEET from the value of the matching day of table TBL_COSTING. I have no idea to find out how I substract the right values from the right day.
I really appreciate your help, since this is spinning me out.....
Chris

Answer 1

I would suggest something like this:
SELECT DAY_OF_WEEK, SUM(HOURS_TOTAL) HOURS_LEFT FROM (
SELECT
TO_CHAR(DAY_DATE, 'DAY') DAY_OF_WEEK,
TIMESHEET_DATA.calculate_hours_project(HOURS_TOTAL) HOURS_TOTAL
FROM TBL_TIMESHEET
where USER_ID = in_user_id
AND PERIOD = in_period
UNION ALL
SELECT
'MONDAY' DAY_OF_WEEK,
- SUM(timesheet_data.calculate_hours_project(HOURS_MON)) HOURS_TOTAL
FROM TBL_COSTING
WHERE USER_ID = in_user_id
AND PERIOD = in_period
UNION ALL
SELECT
'TUESDAY' DAY_OF_WEEK,
- SUM(timesheet_data.calculate_hours_project(HOURS_TUE)) HOURS_TOTAL
FROM TBL_COSTING
WHERE USER_ID = in_user_id
AND PERIOD = in_period
UNION ALL
) GROUP BY DAY_OF_WEEK;