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Oracle Combina varias columnas en una

Puedes usar UNPIVOT :

Configuración de Oracle :

CREATE TABLE your_table ( spot, id, sunday, monday, tuesday, wednesday, thursday, friday, saturday ) AS
  SELECT 'A', 1, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4 FROM DUAL UNION ALL
  SELECT 'A', 2, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45 FROM DUAL UNION ALL
  SELECT 'A', 3, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5 FROM DUAL;

Consulta :

SELECT *
FROM   your_table
UNPIVOT ( Value FOR Day_of_week IN (
  sunday    AS 1,
  monday    AS 2,
  tuesday   AS 3,
  wednesday AS 4,
  thursday  AS 5,
  friday    AS 6,
  saturday  AS 7
 ) );

Salida :

S ID DAY_OF_WEEK VALUE
- -- ----------- -----
A  1           1    .1
A  1           2   .15
A  1           3    .2
A  1           4   .25
A  1           5    .3
A  1           6   .35
A  1           7    .4
A  2           1   .15
A  2           2    .2
A  2           3   .25
A  2           4    .3
A  2           5   .35
A  2           6    .4
A  2           7   .45
A  3           1    .2
A  3           2   .25
A  3           3    .3
A  3           4   .35
A  3           5    .4
A  3           6   .45
A  3           7    .5