Oracle Kết hợp nhiều cột thành một

Bạn có thể sử dụng UNPIVOT :

Thiết lập 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;

Truy vấn :

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
 ) );

Đầu ra :

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