Question

i got a question this is what i have

SQL> desc trktripleg
 Name                                      Null?    Type
 ----------------------------------------- -------- ----------------------------

 T#                                        NOT NULL NUMBER(10)
 LEG#                                      NOT NULL NUMBER(2)
 DEPARTURE                                 NOT NULL VARCHAR2(30)
 DESTINATION                               NOT NULL VARCHAR2(30)

I tried do the following

SQL> select destination,departure from trktripleg where T#=15;

DESTINATION                    DEPARTURE
------------------------------ ------------------------------
Adelaide                       Melbourne
Melbourne                      Sydney

How do i make it this way…

SOURCE     DESTINATION   DESTINATION2

Adelaide   Melbourne    Sydney

Assume if there only 1 destination

SQL> select destination,departure from trktripleg where T#=11;

DESTINATION                    DEPARTURE
------------------------------ ------------------------------
Sydney                         Melbourne


SOURCE     DESTINATION   DESTINATION2

Adelaide   Melbourne    

I am doing view now as like i provide the T# , it will display the source destination depature

Some raw insert data..

INSERT INTO TRKTRIPLEG VALUES(11, 1, 'Melbourne', 'Sydney');

INSERT INTO TRKTRIPLEG VALUES(15, 1, 'Sydney', 'Melbourne');
INSERT INTO TRKTRIPLEG VALUES(15, 2, 'Melbourne', 'Adelaide');

Thanks for all help. I am using oracle sql.

Answer 1

If I understood your schema correctly you can do this

 SELECT   t1.departure AS Source,
         t1.destination AS Destination1,
         t2.destination AS Destination2
  FROM      trktripleg t1
         LEFT OUTER JOIN
            trktripleg t2
         ON t2.T# = t1.T# AND t2.LEG# = 2
 WHERE   t1.LEG# = 1;

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