Removing duplicate results while using UNION SELECT

Question

Ive got a problem with a MySQL query.

Let\'s say, we have two tables:

id qty

1......1

2......1

3......1

4......3

Answer 1

GROUP BY didnt help either

Really? Did you try like this?

SELECT id, MAX(qty) AS qty
FROM
(
    SELECT id, qty FROM table1
    UNION ALL
    SELECT id, qty FROM table2
) T1
GROUP BY id

Answer 2

You can use UNION DISTINCT. Maybe it runs...

SELECT * FROM t1 WHERE ...

UNION DISTINCT

SELECT * FROM t2 WHERE ...