Transposing column 1 data as columns and column 2 data as records

Question

Hi Sirs,
I have a table having data in the form
Present data format          
Interview_no     Question     Answer
1     Q1     A1.1
1     Q2     A1.2
1     Q3     A1.3
1     Q4     A1.4
1     Q5     A1.5
1     Q6     A1.6
1     Q7     A1.7
2     Q1     A2.1
2     Q2     A2.2
2     Q3     A2.3
2     Q4     A2.4
2     Q5     A2.5
2     Q6     A2.6
2     Q7     A2.7
3     Q1     A3.1
3     Q2     A3.2
3     Q3     A3.3
3     Q4     A3.4
3     Q5     A3.5
3     Q6     A3.6
3     Q7     A3.7
4     Q1     A4.1
4     Q2     A4.2
4     Q3     A4.3
4     Q4     A4.4
4     Q5     A4.5
4     Q6     A4.6
4     Q7     A4.7
what I need is to change it into
Required format                                   
Interview_no     Q1     Q2     Q3     Q4     Q5     Q6     Q7
1     A1.1     A1.2     A1.3     A1.4     A1.5     A1.6     A1.7
2     A2.1     A2.2     A2.3     A2.4     A2.5     A2.6     A2.7
3     A3.1     A3.2     A3.3     A3.4     A3.5     A3.6     A3.7
4     A4.1     A4.2     A4.3     A4.4     A4.5     A4.6     A4.7
I am sorry to use that much of space but I think this was the best way to ask the problem. Can we do this using SQL only or we need to go for Pl/Sql I have tried writing a procedure but can't get what eactly I want. I also serched on the net there are a few articles on transposing but they didn't help a lot.
Please help me with the code.
Thanks & Regards

Answer 1

SQL> ed
Wrote file afiedt.buf
  1  with t as (select 1 as interview_no, 'Q1' as question, 'A1.1' as answer from dual union all
  2  select 1, 'Q2', 'A1.2' from dual union all
  3  select 1, 'Q3', 'A1.3' from dual union all
  4  select 1, 'Q4', 'A1.4' from dual union all
  5  select 1, 'Q5', 'A1.5' from dual union all
  6  select 1, 'Q6', 'A1.6' from dual union all
  7  select 1, 'Q7', 'A1.7' from dual union all
  8  select 2, 'Q1', 'A2.1' from dual union all
  9  select 2, 'Q2', 'A2.2' from dual union all
10  select 2, 'Q3', 'A2.3' from dual union all
11  select 2, 'Q4', 'A2.4' from dual union all
12  select 2, 'Q5', 'A2.5' from dual union all
13  select 2, 'Q6', 'A2.6' from dual union all
14  select 2, 'Q7', 'A2.7' from dual union all
15  select 3, 'Q1', 'A3.1' from dual union all
16  select 3, 'Q2', 'A3.2' from dual union all
17  select 3, 'Q3', 'A3.3' from dual union all
18  select 3, 'Q4', 'A3.4' from dual union all
19  select 3, 'Q5', 'A3.5' from dual union all
20  select 3, 'Q6', 'A3.6' from dual union all
21  select 3, 'Q7', 'A3.7' from dual union all
22  select 4, 'Q1', 'A4.1' from dual union all
23  select 4, 'Q2', 'A4.2' from dual union all
24  select 4, 'Q3', 'A4.3' from dual union all
25  select 4, 'Q4', 'A4.4' from dual union all
26  select 4, 'Q5', 'A4.5' from dual union all
27  select 4, 'Q6', 'A4.6' from dual union all
28  select 4, 'Q7', 'A4.7' from dual)
29  -- END OF TEST DATA
30  select interview_no
31        ,max(decode(question,'Q1',answer)) as Q1
32        ,max(decode(question,'Q2',answer)) as Q2
33        ,max(decode(question,'Q3',answer)) as Q3
34        ,max(decode(question,'Q4',answer)) as Q4
35        ,max(decode(question,'Q5',answer)) as Q5
36        ,max(decode(question,'Q6',answer)) as Q6
37        ,max(decode(question,'Q7',answer)) as Q7
38  from t
39  group by interview_no
40* order by interview_no
SQL> /
INTERVIEW_NO Q1   Q2   Q3   Q4   Q5   Q6   Q7
           1 A1.1 A1.2 A1.3 A1.4 A1.5 A1.6 A1.7
           2 A2.1 A2.2 A2.3 A2.4 A2.5 A2.6 A2.7
           3 A3.1 A3.2 A3.3 A3.4 A3.5 A3.6 A3.7
           4 A4.1 A4.2 A4.3 A4.4 A4.5 A4.6 A4.7
SQL>