PL/SQL-Function or Procedure

Question

Hi!
I need to create a PL/SQL-Function or procedure that checks the database (10g) for (all) connections for a flight route. The function or procedure should be designed to get the outbound and return flights and store the information in a new table (maybe temporary table). Or course, there are several flights for a given route, depending on date and price. But let's use this sample data for now:
Flight_availability
conn_id      carrier_id      flight_no     origin     departure     destination     arrival     flight_date
1     BA     235     LHR     07:10     JFK     9:00     20-Jul-07
2     UA     712     JFK     12:00     LAX     18:00     20-Jul-07
3     UA     710     LAX     08:00     JFK     14:00     08-AUG-07
4     BA     237     JFK     16:30     LHR     06:30     09-AUG-07
Flight_route
route_id      route_description
1     London-Heathrow (LHR) to Los Angeles (LAX)
2     Los Angeles (LAX) to London-Heathrow
Flight_segment
route_id      segment_id      conn_id
1     1     1
1     2     2
2     1     3
2     2     4
Would appreciate any help! Sorry for the formatting!
Thank you!

Answer 1

From the information you've given, the most we can do is to join the details together.
SQL> With flight_avail as (select 1 as conn_id, 'BA' as carrier_id, 235 as flight_no, 'LHR' as origin, '07:10' as departure, 'JFK' as destination, '09:00' as arrival, '20-Jul-07' as flight_date from dual union all
  2                        select 2, 'UA', 712, 'JFK', '12:00', 'LAX', '18:00', '20-Jul-07' from dual union all
  3                        select 3, 'UA', 710, 'LAX', '08:00', 'JFK', '14:00', '08-AUG-07' from dual union all
  4                        select 4, 'BA', 237, 'JFK', '16:30', 'LHR', '06:30', '09-AUG-07' from dual),
  5       flight_route as (select 1 as route_id, 'London-Heathrow (LHR) to Los Angeles (LAX)' as route_description from dual union all
  6                        select 2, 'Los Angeles (LAX) to London-Heathrow' from dual),
  7       flight_segment as (select 1 as route_id, 1 as segment_id, 1 as conn_id from dual union all
  8                          select 1,2,2 from dual union all
  9                          select 2,1,3 from dual union all
10                          select 2,2,4 from dual)
11  -- end of test data
12  select r.route_description, s.segment_id, a.carrier_id, a.flight_no, a.origin, a.departure, a.destination, a.arrival, a.flight_date
13  from flight_route r JOIN flight_segment s ON (s.route_id = r.route_id)
14                      JOIN flight_avail a ON (a.conn_id = s.conn_id)
15  order by 1,2
16  /
ROUTE_DESCRIPTION                          SEGMENT_ID CA  FLIGHT_NO ORI DEPAR DES ARRIV FLIGHT_DA
London-Heathrow (LHR) to Los Angeles (LAX)          1 BA        235 LHR 07:10 JFK 09:00 20-Jul-07
London-Heathrow (LHR) to Los Angeles (LAX)          2 UA        712 JFK 12:00 LAX 18:00 20-Jul-07
Los Angeles (LAX) to London-Heathrow                1 UA        710 LAX 08:00 JFK 14:00 08-AUG-07
Los Angeles (LAX) to London-Heathrow                2 BA        237 JFK 16:30 LHR 06:30 09-AUG-07
SQL>So what are your requirements exactly? What do you mean by "check" the datatbase for all connections for a flight route. i.e. what is the process of "checking" and what are the results of that "check"? What information needs storing in the new or temporary table?
You need to expand on your explanation of requirements a little more.