I have a table called `child` like this

```
+---------+-----+
| name    | age |
+---------+-----+
| Alfred  |   5 |
| Maria   |   6 |
+---------+-----+

```

When I run `SELECT 'name' FROM 'child'` I get both rows. No problem. It is what I expected.

But if I run `SELECT 'name', MAX('age') FROM 'child'` I get:

```
+---------+------------+
| name    | MAX(`age`) |
+---------+------------+
| Alfredo |          6 |
+---------+------------+

```

This result is extrange for me.. I expected both rows like before, why it is outputting just one row? why `Alfredo` is outputted since Maria is who is 6 years old? where can I find *documentation* about this behaviour?