What is the difference between these 2 queries?

```
SELECT f.name, 
       u.name, 
       u.id 
FROM   families f 
       JOIN units u 
         ON f.unit_id = u.id 
HAVING u.id IN( 43, 413, 22 )

```

And:

```
SELECT f.name, 
       u.name, 
       u.id 
FROM   families f 
       JOIN units u 
         ON f.unit_id = u.id 
WHERE  u.id IN( 43, 413, 22 )

```

The result of these 2 queries is exactly the same. So where is the difference?