Oracle 11g: Unpivot multiple columns and include column name

Question

I'm triyng to unpivot multiple columns in my dataset. Here's what my data look like.

CREATE TABLE  T5 (idnum NUMBER,f1 NUMBER(10,5),f2 NUMBER(10,5),f3 NUMBER(10,5)
                 ,e1 NUMBER(10,5),e2 NUMBER(10,5)
                 ,h1 NUMBER(10,5),h2 NUMBER(10,5));

INSERT INTO T5 (IDNUM,F1,F2,F3,E1,E2,H1,H2) 
VALUES (1,'10.2004','5.009','7.330','9.008','8.003','.99383','1.43243');
INSERT INTO T5 (IDNUM,F1,F2,F3,E1,E2,H1,H2
VALUES (2,'4.2004','6.009','9.330','4.7008','4.60333','1.993','3.3243');
INSERT INTO T5 (IDNUM,F1,F2,F3,E1,E2,H1,H2)
VALUES (3,'10.2040','52.6009','67.330','9.5008','8.003','.99383','1.43243');
INSERT INTO T5 (IDNUM,F1,F2,F3,E1,E2,H1,H2)
VALUES (4,'9.20704','45.009','17.330','29.008','5.003','3.9583','1.243');

COMMIT;

select * from t5;

IDNUM    F1    F2     F3        E1      E2       H1     H2

1   10.2004 5.009   7.33    9.008   8.003   0.99383 1.43243
2   4.2004  6.009   9.33    4.7008  4.60333 1.993   3.3243
3   10.204  52.6009 67.33   9.5008  8.003   0.99383 1.43243
4   9.20704 45.009  17.33   29.008  5.003   3.9583  1.243

I'm unpivoting like so...

select *
from (select IDNUM,F1,F2,F3,E1,E2,H1,H2,
      null as E3,null as H3
      from T5)
UnPivot((F,E,H) for sk in ((F1,E1,H1) as 1,
                              (F2,E2,H2) as 2,
                              (F3,E3,H3) as 3))
order by IDNUM,SK;

IDNUM  SK        F        E        H
-----  --  -------  -------  -------
    1   1  10.2004    9.008   .99383
    1   2    5.009    8.003  1.43243
    1   3     7.33     null     null
    2   1   4.2004   4.7008    1.993
    2   2    6.009  4.60333   3.3243
    2   3     9.33     null     null
    3   1   10.204   9.5008   .99383
    3   2  52.6009    8.003  1.43243
    3   3    67.33     null     null
    4   1  9.20704   29.008   3.9583
    4   2   45.009    5.003    1.243
    4   3    17.33     null     null

But what I really need is as follows...

IDNUM  SK        F        E        H  F_COL_NAME
-----  --  -------  -------  -------  ----------
    1   1  10.2004    9.008   .99383          F1
    1   2    5.009    8.003  1.43243          F2
    1   3     7.33     null     null          F3
    2   1   4.2004   4.7008    1.993          F1
    2   2    6.009  4.60333   3.3243          F2
    2   3     9.33     null     null          F3
    3   1   10.204   9.5008   .99383          F1
    3   2  52.6009    8.003  1.43243          F2
    3   3    67.33     null     null          F3
    4   1  9.20704   29.008   3.9583          F1
    4   2   45.009    5.003    1.243          F2
    4   3    17.33     null     null          F3

How can I do this?

Answer 1

Change your UNPIVOT to be like this

select *
from (
  select IDNUM,F1,F2,F3,E1,E2,H1,H2,
    null as E3,null as H3
  from T5
) A
UnPivot(
  (F,E,H) for sk in (
    (F1,E1,H1) as 'F1',
    (F2,E2,H2) as 'F2',
    (F3,E3,H3) as 'F3')
)
order by IDNUM,SK

This should do the trick