Question

Lets say i have table called Orders

id      qty1    qty2     qty3
-----------------------------------
1       1        2        3
2       0        1        0
3       3        2        1

Result of the query should be as following (Note qty are sum column wise for qty)

productID  qty
----------------
1           4
2           5
3           4

Please help me to make query?

Answer 1

It looks like a very strange table design, and the results you want are even stranger. But this should do it:

SELECT 1 AS productID, SUM(qty1) AS qty FROM Orders

UNION

SELECT 2 AS productID, SUM(qty2) AS qty FROM Orders

UNION

SELECT 3 AS productID, SUM(qty3) AS qty FROM Orders

If you would specify the type of SQL (PostgreSQL, MySQL, Oracle, etc…) server than I might be able to produce a neater query.