How can I Derive columns from derived columns? Is it possible?
I am learning SQL on the job at the moment working on application express. But have hit a problem. As you can see below I have 3 tables ATTENDING, EVENTS and BUDGET, in the select statement below I have 2 derived columns but I would like to add SUM(Related_Expenses+ Course_Expenses) for each row. How is this possible?
SELECT
BUDGET.BUDGET_ID,
BUDGET.BUDGET_TYPE,
BUDGET.ALLOCATION,
(select
NVL(SUM(EVENTS.ORDER_AMMOUNT),0)
from EVENTS, C_YEAR
where EVENTS.BUDGET_ID = BUDGET.BUDGET_ID
and EVENTS.YEAR = C_YEAR.YEAR
) as Course_Expenses,
( select
NVL(SUM(NVL(ATTENDING.ACCOMADATION_BT_AMOUNT,ATTENDING.ACCOMODATION_ESTIMATE)),0)+
NVL(SUM(NVL(ATTENDING.TRAVEL_BT_AMOUNT,ATTENDING.TRAVEL_BOOKED_ESTIMATE)),0)+
NVL(SUM(NVL(ATTENDING.TRAVEL_OTHER_CLAIM,ATTENDING.TRAVEL_OTHER_ESTIMATE)),0)+
NVL(SUM(NVL(ATTENDING.SUBSISTENCE_CLAIM,ATTENDING.SUBSISTENCE_ESTIMATE)),0)
from EVENTS, ATTENDING
where ATTENDING.EVENT_ID = EVENTS.EVENT_ID
and EVENTS.BUDGET_ID = BUDGET.BUDGET_ID
and EVENTS.YEAR = C_YEAR.YEAR
) as Related_Expenses
from BUDGET, C_YEAR
where BUDGET.YEAR = C_YEAR.YEAR
Select yb.budget_id,
yb.budget_type,
yb.allocation,
(yb.course_expenses + yb.related_expenses) total_expenses
From (SELECT BUDGET.BUDGET_ID,
BUDGET.BUDGET_TYPE,
BUDGET.ALLOCATION,
(select NVL(SUM(EVENTS.ORDER_AMMOUNT),0)
from EVENTS, C_YEAR
where EVENTS.BUDGET_ID = BUDGET.BUDGET_ID
and EVENTS.YEAR = C_YEAR.YEAR) as Course_Expenses,
(select NVL(SUM(NVL(ATTENDING.ACCOMADATION_BT_AMOUNT,ATTENDING.ACCOMODATION_ESTIMATE)),0)+
NVL(SUM(NVL(ATTENDING.TRAVEL_BT_AMOUNT,ATTENDING.TRAVEL_BOOKED_ESTIMATE)),0)+
NVL(SUM(NVL(ATTENDING.TRAVEL_OTHER_CLAIM,ATTENDING.TRAVEL_OTHER_ESTIMATE)),0)+
NVL(SUM(NVL(ATTENDING.SUBSISTENCE_CLAIM,ATTENDING.SUBSISTENCE_ESTIMATE)),0)
from EVENTS, ATTENDING
where ATTENDING.EVENT_ID = EVENTS.EVENT_ID
and EVENTS.BUDGET_ID = BUDGET.BUDGET_ID
and EVENTS.YEAR = C_YEAR.YEAR) as Related_Expenses
from BUDGET, C_YEAR
where BUDGET.YEAR = C_YEAR.YEAR) yb
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