Show row data into columns

Question

Hi guys
i have data coming in multiple rows and want to show same data in columns like multiple colours per product. colour are fixed in numbers i.e only three colours are there per product not more than that..
sample data is like this
id product_name colour
101 A red
101 A black
101 A Green
result required:-
id product_name colour1 colour2 colour3
101 A red black green
thanks & Regards

Answer 1

Hi,
That's called a Pivot.  In Oracle 8.1 and higher, you can use ROW_NUMBER, CASE, and an aggregate function, such as MIN for pivoting. (Starting in Oracle 11, there's SELECT ... PIVOT.)
You didn't post CREATE TABLE and INSERT statements for your table, so I'll use scott.emp to illustrate:
WITH   got_r_num   AS
    SELECT  deptno
    ,       job
    ,       ename
    ,       ROW_NUMBER () OVER ( PARTITION BY  deptno
                                 ,             job
                                 ORDER BY      ename
                                )  AS r_num
    FROM    scott.emp
SELECT    deptno
,         job
,         MIN (CASE WHEN r_num = 1 THEN ename END)   AS ename_1
,         MIN (CASE WHEN r_num = 2 THEN ename END)   AS ename_2
,         MIN (CASE WHEN r_num = 3 THEN ename END)   AS ename_3
FROM      got_r_num
GROUP BY  deptno
,         job
ORDER BY  deptno
,         job
Output:
    DEPTNO JOB       ENAME_1    ENAME_2    ENAME_3
        10 CLERK     MILLER
        10 MANAGER   CLARK
        10 PRESIDENT KING
        20 ANALYST   FORD       SCOTT
        20 CLERK     ADAMS      SMITH
        20 MANAGER   JONES
        30 CLERK     JAMES
        30 MANAGER   BLAKE
        30 SALESMAN  ALLEN      MARTIN     TURNER
If you do happen to have more than 3 items, the query still works, but only the first 3 are shown.  (In deptno=10, there is a 4th SALESMAN named WARD.)