Help With Querying A Database

Question

Hi,
I have the script below that calculates the total length of phone calls each customer has made and shows the total cost of there phone calls, when this query is displayed i would also like to show the customers phone number as well as the customer id. The customer id is already in the query and working, however when i add cust_area_code to the query, the query runs but it does not display the customers phone number.
select customer.cust_id as "Customer ID"
     ,sum(calls.elapsed_minutes) as "Total Call Length (Mins)"
     ,sum(calls.elapsed_minutes*calls.rate) as "Total Cost Of Calls £"
from
     (select cust_id
          ,cust_area_code --- This is the line i have added in
          ,round((end_date_time-start_date_time)*1440) as elapsed_minutes
          ,chrg_per_minute as rate
     from phonecall
     ) calls
     ,customer
where customer.cust_id = calls.cust_id
group by customer.cust_id,calls.cust_id
order by customer.cust_id ascThanks in advance

Answer 1

you don have the cust_area_code in the customer table use joins to link those tables and use it in the first part of the code
select customer.cust_id as "Customer ID",
PHONECALLS.CUST_AREA_CODE as "Phone No"
     ,sum(calls.elapsed_minutes) as "Total Call Length (Mins)"
     ,sum(calls.elapsed_minutes*calls.rate) as "Total Cost Of Calls £"
from
     (select cust_id
          ,cust_area_code --- This is the line i have added in
          ,round((end_date_time-start_date_time)*1440) as elapsed_minutes
          ,chrg_per_minute as rate
     from phonecall
     ) calls
     ,customer,
phonecall
where customer.cust_id = calls.cust_id
group by customer.cust_id,calls.cust_id
order by customer.cust_id asc
Message was edited by:
Maran.E