Select records based on column priority

Question

First of all, the title of this question is horrible, but I didn\'t find a better way to describe my issue.

There\'s probably a very easy way to do this, but I couldn\'t

Answer 1

Your query is nearly correct. Just use PRODUCTID and not ID.

SELECT * 
FROM xx
WHERE f_COLOUR = "GREEN"
UNION
SELECT * 
FROM xx 
WHERE PRODUCTID not in 
                (SELECT PRODUCTID
                 FROM xx 
                 WHERE f_COLOUR = "GREEN");

SQLFiddle Demo