Need help with query for converting columns to rows

Question

Hello,
I know this is a very common question asked in the forum. I have searched regading this, i did find some threads, but i was not able to achieve what i require from the answers posted. So anybody please help me.
I have a table which is having multiple columns as follows:
Insert into table_1 (X,Y,Z,A,B,C,D,E,F,G,H,I) values (0,0,2,0,0,1,3,0,0,0,0,0);I want to convert the result into a two column, multiple rows i.e., I want the result as follows:
Col1 Col2
X      0
Y     0
Z      2
A     0
B     0
C     1
D     3
E     0
F     0
G     0
H     0
I      0Please anybody help me in writing the query for this..

Answer 1

Is this what you are expecting:
SQL> WITH T AS
  2  (
  3  SELECT 0 X, 0 Y, 2 Z, 0 A, 0 B, 1 C, 3 D, 0 E, 0 F, 0 G, 0 H, 0 I FROM DUAL
  4  )
  5  SELECT  'X' col1, X col2 FROM T
  6  UNION ALL
  7  SELECT  'Y' col1, Y col2 FROM T
  8  UNION ALL
  9  SELECT  'Z' col1, Z col2 FROM T
10  UNION ALL
11  SELECT  'A' col1, A col2 FROM T
12  UNION ALL
13  SELECT  'B' col1, B col2 FROM T
14  UNION ALL
15  SELECT  'C' col1, C col2 FROM T
16  UNION ALL
17  SELECT  'D' col1, D col2 FROM T
18  UNION ALL
19  SELECT  'E' col1, E col2 FROM T
20  UNION ALL
21  SELECT  'F' col1, F col2 FROM T
22  UNION ALL
23  SELECT  'G' col1, G col2 FROM T
24  UNION ALL
25  SELECT  'H' col1, H col2 FROM T
26  UNION ALL
27  SELECT  'I' col1, I col2 FROM T
28  /
C       COL2                                                                   
X          0                                                                   
Y          0                                                                   
Z          2                                                                   
A          0                                                                   
B          0                                                                   
C          1                                                                   
D          3                                                                   
E          0                                                                   
F          0                                                                   
G          0                                                                   
H          0                                                                   
C       COL2                                                                   
I          0                                                                   
12 rows selected.