With this simple query I can find the ids of all jars that contain *either* red balls **or** blue balls:

```
SELECT id FROM "Jars" J
JOIN "Balls" B ON B.jarId = J.jarId
WHERE B.color = 'red' OR B.color = 'blue'
GROUP BY id

```

How can I find the ids of all jars that contain *both* red balls **and** blue balls?