Can you do this???

Question

I have a SELECT statement that needs a SUM action. However, do get the correct SUM, I have to do a sub-query inside of the SUM statement. Is this possible?
I am somewhat a novice to oracle/sql, so any help would be appreciated.Thanks

Answer 1

Without knowing more this is the best I can give you:
-- route -
     route_id PK
     route_mi
-- trips -
     trip_id PK
     route_id FK
     pilot_id FK   
-- employees -
     employee_id PK
     employee_name
     crew_id FK
-- crew -
     crew_id PK
     crew_name (U)
     employee_id FK
SELECT E.employee_name
, SUM(R.route_mi)
FROM employee E
, crew C
, trip T
, route R
WHERE E.employee_id = C.employee_id
AND C.crew_name = 'Pilot'
AND T.pilot_id = E.employee_id
AND R.route_id = T.route_id
GROUP BY E.employee_nameWarning: Above code not tested on fake setup!