How to get columns as rows

Question

Hi everybody,
I have a table qualities with columns empno, q1, q2, q3, q4, q5, q6, q7, q8, q9, q10. All the columns are number data type. The table has 10,000 records. How can i select each column as a different row for each empno.
Please help.
Thanks and regards
Sukanto

Answer 1

A couple of options might be something like...
SELECT
    EMPNO,
    1 AS QUANTITY_TYPE,
    Q1 AS QUANTITY
FROM
    YOUR_TABLE
UNION ALL
SELECT
    EMPNO,
    2 AS QUANTITY_TYPE,
    Q2 AS QUANTITY
FROM
    YOUR_TABLE
UNION ALL
SELECT
    EMPNO,
    3 AS QUANTITY_TYPE,
    Q3 AS QUANTITY
FROM
    YOUR_TABLE
UNION ALL
SELECT
    EMPNO,
    10 AS QUANTITY_TYPE,
    Q10 AS QUANTITY
FROM
    YOUR_TABLE...or...
WITH QUANTITY_TYPES AS
    SELECT 1 AS QUANTITY_TYPE FROM DUAL
    UNION ALL
    SELECT 2 AS QUANTITY_TYPE FROM DUAL
    UNION ALL
    SELECT 3 AS QUANTITY_TYPE FROM DUAL
    UNION ALL
    SELECT 10 AS QUANTITY_TYPE FROM DUAL
SELECT
    YOUR_TABLE.EMPNO,
    QUANTITY_TYPES.QUANTITY_TYPE,
    CASE QUANTITY_TYPES.QUANTITY_TYPE
        WHEN 1 THEN
            YOUR_TABLE.Q1
        WHEN 2 THEN
            YOUR_TABLE.Q2
        WHEN 3 THEN
            YOUR_TABLE.Q3
        WHEN 10 THEN
            YOUR_TABLE.Q10
    END AS QUANTITY
FROM
    YOUR_TABLE,
    QUANTITY_TYPES