How to select datas that doesnt match in another column

Question

So i have this table A:

color        ID       MODEL
-----------------------------
red        | 10   |   HONDA
blue       | 10   |   TOYOTA
red        | 15   |            


        

Answer 1

I think your expected result should just be red 15. Red 30 would not qualify because of yellow 30, which shares the same id. Check out my code:

SELECT t.id, t.color
FROM t
INNER JOIN
(SELECT id
 FROM t
 GROUP BY id
 HAVING COUNT(*) = 1) sub
ON t.id = sub.id
WHERE color = 'red'
OR color = 'blue'