sql - Oracle Combine several columns into one

Question

I have a question in regarding to Oracle Sql,

If I have a data called A, with 8 columns:

Spot| ID |Sunday|Monday|Tuesday|Wednesday|Thursday|Friday|Saturday 
-------------------------------------------------------------------------
   A| 1  | 0.1  |0.15  | ...........................................
-------------------------------------------------------------------------
   A| 2  | 0.2  |0.2   | ...........................................
-------------------------------------------------------------------------
   A| 3  | 0.3  |0.25  | ...........................................
-------------------------------------------------------------------------
   A| 4  | 0.4  |0.4   | ...........................................
-------------------------------------------------------------------------

Can I convert it to a table B like this:

Spot| Day of Week  | ID | Value 
-------------------------------------------------------------------------
   A| 1            | 1  |  0.1 
-------------------------------------------------------------------------
   A| 1            | 2  |  0.2 
-------------------------------------------------------------------------
   A| 1            | 3  |  0.3 
-------------------------------------------------------------------------
   A| 1            | 4  |  0.4 
-------------------------------------------------------------------------
   A| 2            | 1  |  0.15
-------------------------------------------------------------------------
 .......................................................................

Which is to combine columns (Sunday through Saturday) to a new column called 'Day of Week'

How can I do that please? Thanks!

Answer 1

You can use UNPIVOT:

Oracle Setup:

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;

Query:

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
 ) );

Output:

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