How to display rows of data into different columns?

Question

I'm new to SQL and currently this is what I'm trying to do: 
Display multiple rows of data into different columns within the same row
I have a table like this:
    CREATE TABLE TRIPLEG(
        T#              NUMBER(10)      NOT NULL,
        LEG#            NUMBER(2)       NOT NULL,
        DEPARTURE       VARCHAR(30)     NOT NULL,
        DESTINATION     VARCHAR(30)     NOT NULL,
        CONSTRAINT TRIPLEG_PKEY PRIMARY KEY (T#, LEG#),
        CONSTRAINT TRIPLEG_UNIQUE UNIQUE(T#, DEPARTURE, DESTINATION),
        CONSTRAINT TRIPLEG_FKEY1 FOREIGN KEY (T#) REFERENCES TRIP(T#) );
    INSERT INTO TRIPLEG VALUES( 1, 1, 'Sydney', 'Melbourne');
    INSERT INTO TRIPLEG VALUES( 1, 2, 'Melbourne', 'Adelaide');
The result should be something like this:
> T#  | ORIGIN  | DESTINATION1  |  DESTINATION2 
> 1   | SYDNEY  | MELBORUNE     | ADELAIDE
The query should include the `COUNT(T#) < 3` since I only need to display the records less than 3. How can I achieve the results that I want using relational views???
Thanks!!!

Answer 1

T#
LEG#
DEPARTURE
DESTINATION
1
1
Sydney
Melbourne
1
2
Melbourne
Adelaide
1
3
Adelaide
India
1
4
India
Dubai
2
1
India
UAE
2
2
UAE
Germany
2
3
Germany
USA
On 11gr2, you may use this :
  SELECT t#,
         REGEXP_REPLACE (
            LISTAGG (departure || '->' || destination, ' ')
               WITHIN GROUP (ORDER BY t#, leg#),
            '([^ ]+) \1+',
            '\1')
    FROM tripleg
    where leg#<=3
GROUP BY t#;
Output:
1 Sydney->Melbourne->Adelaide->India
2 India->UAE->Germany->USA
Cheers,
Manik.