Pivot function in Oracle 10g???

Question

Hello everybody,
at the beginning of the week I had a simple problem (I thought that...), but now after trying and trying, I can't find a solution for it. First of all I'm working on Oracle 10g with the version 10.2.0.4.0. I can't change the version, it's standard in the whole company...
At the beginning I have a table like the following one, but please note, that the compartment, the type and the amount are flexible and can change at any time:
comp type amount
a1 6280 10
a2 6280 20
a2 4810 15
a2 1147 12
a3 6280 33
Now I want the table to look like this:
a1 a2 a3
1147 0 12 0
4810 0 15 0
6280 10 20 33
A simple question in Excel for example, I just use the pivot function and have it fixed within 10seconds. But how can I do sth. like this in Oracle with simple SQL? Or it can be PL/SQL too, cause I will use this in an APEX application.
Can you please give me a hint or a solution? But as stated before a1, a2, a3 are just examples it is possible that tomorrow a4, a5 and so on are coming. If it is necessary I can also create additional tables and views of course!
Thanks for your help!
Regards
hoge

Answer 1

Hi Hoge!
Here is your solution:
SELECT TYPE,
       sum(a1) AS a1,
       sum(a2) AS a2,
       sum(a3) AS a3
  FROM (SELECT TYPE,
               decode(comp, 'a1', amount, 0) AS a1,
               decode(comp, 'a2', amount, 0) AS a2,
               decode(comp, 'a3', amount, 0) AS a3
          FROM test)
  GROUP BY TYPE
  ORDER BY TYPE; And here is my test case setup:
CREATE TABLE test
    (comp VARCHAR2(255),
     TYPE NUMBER,
     amount NUMBER);
INSERT INTO test(comp, TYPE, amount) VALUES('a1', 6280, 10);
INSERT INTO test(comp, TYPE, amount) VALUES('a2', 6280, 20);
INSERT INTO test(comp, TYPE, amount) VALUES('a2', 4810, 15);
INSERT INTO test(comp, TYPE, amount) VALUES('a2', 1147, 12);
INSERT INTO test(comp, TYPE, amount) VALUES('a3', 6280, 33);
commit;Best regards,
Matt