Creating two rows from a single row information

Question

Hi,
I have data that will always be returned as a single row from a join of tables t1, t2.
However I want the single row to be split into two rows. i.e First row containing some fields and second row containing th remaining fields.
I think there might be a thread already existing. Can you please point me in the right direction if it is.
select t1.c1, t1.c2, t2.c1, t2.c2
from t1, t2
where t1.c3 = t2.c3
I expect the output 2 rows like the following
t1.c1 t2.c1
t1.c2 t2.c2
Thanks

Answer 1

SQL>WITH t1 AS (SELECT     't1c1_' || ROWNUM AS c1, 't1c2_' || ROWNUM AS c2, ROWNUM AS c3
  2                    FROM DUAL
  3              CONNECT BY LEVEL <= 3),
  4       t2 AS (SELECT     't2c1_' || ROWNUM AS c1, 't2c2_' || ROWNUM AS c2, ROWNUM AS c3
  5                    FROM DUAL
  6              CONNECT BY LEVEL <= 3),
  7       t3 AS (SELECT t1.c1 AS c11, t1.c2 AS c12, t2.c1 AS c21, t2.c2 AS c22, ROWNUM AS r
  8                FROM t1, t2
  9               WHERE t1.c3 = t2.c3)
10  SELECT   a, b
11      FROM (SELECT c11 AS a, c21 AS b, r, 1 AS s
12              FROM t3
13            UNION ALL
14            SELECT c12, c22, r, 2 AS s
15              FROM t3)
16  ORDER BY r, s;
A                                             B
t1c1_1                                        t2c1_1
t1c2_1                                        t2c2_1
t1c1_2                                        t2c1_2
t1c2_2                                        t2c2_2
t1c1_3                                        t2c1_3
t1c2_3                                        t2c2_3Urs