Selecting connecting flights query

Question

Hi,
In our system we have a base table with all connecting flights. Each flight leg(segment) is stored as a record (PK is CID and flight_no), however
both flight segments have the same id (data set). For example:
Segments(Legs)
CID    Flight_no  From To
1       UA123     LAX  DEN
1       UA456     DEN JFKand the routes base table stores the starting and ending point of a flight, but not the stopover:
Routes
From  To
LAX   JFKThe problem is finding those connecting flights according to the route.
Help on the sql would be greatly appreciated! Thanks!
Edited by: user545194 on 01.10.2012 11:08

Answer 1

Hi again,
Here is the table ddl with sample data.
Table DDL:
CREATE TABLE "TEST"."SAMPLE_DATA_TBL"
    "CID"          NUMBER NOT NULL ENABLE,
    "SNR"          NUMBER(1,0),
    "CS"           VARCHAR2(4 BYTE),
    "FLIGHT_NO"    VARCHAR2(8 BYTE) NOT NULL ENABLE,
    "FROM_AP"      VARCHAR2(3 BYTE) NOT NULL ENABLE,
    "DEPART"       VARCHAR2(20 BYTE),
    "TO_AP"        VARCHAR2(3 BYTE) NOT NULL ENABLE,
    "ARRIVE"       VARCHAR2(20 BYTE),
    "FLT_DURATION" VARCHAR2(20 BYTE),
    "DEP_T"        VARCHAR2(4 BYTE),
    "ARR_T"        VARCHAR2(4 BYTE)
  );Sample data:
Insert into TEST.SAMPLE_DATA (CID,SNR,CS,FLIGHT_NO,FROM_AP,DEPART,TO_AP,ARRIVE,FLT_DURATION,DEP_T,ARR_T) values ('8','1',null,'LH3487','ADB','04:10:00','TXL','06:05:00','04:55:00','I','-');
Insert into TEST.SAMPLE_DATA (CID,SNR,CS,FLIGHT_NO,FROM_AP,DEPART,TO_AP,ARRIVE,FLT_DURATION,DEP_T,ARR_T) values ('8','2',null,'LH2057','TXL','06:50:00','MUC','08:05:00',null,'-','2');
Insert into TEST.SAMPLE_DATA (CID,SNR,CS,FLIGHT_NO,FROM_AP,DEPART,TO_AP,ARRIVE,FLT_DURATION,DEP_T,ARR_T) values ('123','1',null,'LH3301','AGP','13:35:00','TXL','16:55:00','06:45:00','3','-');
Insert into TEST.SAMPLE_DATA (CID,SNR,CS,FLIGHT_NO,FROM_AP,DEPART,TO_AP,ARRIVE,FLT_DURATION,DEP_T,ARR_T) values ('123','2',null,'LH197','TXL','19:10:00','FRA','20:20:00',null,'-','1');
Insert into TEST.SAMPLE_DATA (CID,SNR,CS,FLIGHT_NO,FROM_AP,DEPART,TO_AP,ARRIVE,FLT_DURATION,DEP_T,ARR_T) values ('213','1',null,'LH693','AMM','02:45:00','FRA','06:25:00','07:30:00','1','1');
Insert into TEST.SAMPLE_DATA (CID,SNR,CS,FLIGHT_NO,FROM_AP,DEPART,TO_AP,ARRIVE,FLT_DURATION,DEP_T,ARR_T) values ('213','2',null,'LH6332','FRA','07:45:00','VIE','09:15:00',null,'1','-');
Insert into TEST.SAMPLE_DATA (CID,SNR,CS,FLIGHT_NO,FROM_AP,DEPART,TO_AP,ARRIVE,FLT_DURATION,DEP_T,ARR_T) values ('281','1','CL','LH2307','AMS','17:25:00','MUC','18:50:00','03:30:00','-','2');
Insert into TEST.SAMPLE_DATA (CID,SNR,CS,FLIGHT_NO,FROM_AP,DEPART,TO_AP,ARRIVE,FLT_DURATION,DEP_T,ARR_T) values ('281','2',null,'LH123','MUC','19:50:00','FRA','20:55:00',null,'2','1');
Insert into TEST.SAMPLE_DATA (CID,SNR,CS,FLIGHT_NO,FROM_AP,DEPART,TO_AP,ARRIVE,FLT_DURATION,DEP_T,ARR_T) values ('402','1','SK','LH6059','ARN','15:15:00','TXL','16:45:00','03:25:00','5','-');
Insert into TEST.SAMPLE_DATA (CID,SNR,CS,FLIGHT_NO,FROM_AP,DEPART,TO_AP,ARRIVE,FLT_DURATION,DEP_T,ARR_T) values ('402','2',null,'LH193','TXL','17:30:00','FRA','18:40:00',null,'-','1');Explanation: A connection id (cid) consists of 2 flight legs(segments, snr) and the "trick" is to list both connections through input
of the starting and ending points; i.e. 'AGP' to 'FRA'.
Thanks!