Uma solução que não requer várias autojunções:
Você pode
PIVOT no resultado do ROW_NUMBER() função analítica para obter a saída desejada:SELECT *
FROM (
SELECT t.*,
ROW_NUMBER() OVER ( PARTITION BY test ORDER BY ROWNUM ) AS rn
FROM your_table t
)
PIVOT ( MAX( Reader ) AS reader, MAX( result ) AS result FOR rn IN ( 1, 2, 3 ) );
Saída :
TEST 1_READER 1_RESULT 2_READER 2_RESULT 3_READER 3_RESULT
---- -------- -------- -------- -------- -------- --------
1 John 1.6 Jack 5.2
2 Ursula 2.5 Jack 5.1
3 Albert 3.0
Ou, apenas usando funções de agregação:
SELECT test,
MAX( CASE rn WHEN 1 THEN reader END ) AS reader_1,
MAX( CASE rn WHEN 1 THEN result END ) AS result_1,
MAX( CASE rn WHEN 2 THEN reader END ) AS reader_2,
MAX( CASE rn WHEN 2 THEN result END ) AS result_2,
MAX( CASE rn WHEN 3 THEN reader END ) AS reader_3,
MAX( CASE rn WHEN 3 THEN result END ) AS result_3
FROM (
SELECT t.*,
ROW_NUMBER() OVER ( PARTITION BY test ORDER BY ROWNUM ) AS rn
FROM your_table t
)
GROUP BY test;
