SQLite Forum

> you can't tell whether the x you get is related to the max or the min of the group

Of course you can. Just
```
SELECT 'min', x, min(y)
  FROM foo
 GROUP BY (x/10)
UNION ALL
SELECT 'max', x, max(y)
  FROM foo
 GROUP BY (x/10);
```

I used 'min' and 'max' for illustrative purpose. Could use 0 and 1 too.

Note the `UNION ALL`, to avoid an unnecessary sort+dedup, which I suspect  
if not what you wanted, since then you could have fewer than 2x group rows  
with just `UNION`.