Given the example table below, how can I retrieve the high and low range of the entire group using pure MySQL? Is it possible?

Table:

```
string    low    high
=====================
abc         1      10
abc        11      20
def         2       5
def         3       6

```

Basic Query: *(Obviously this doesn't work, but what would?)*

```
SELECT * from `table` GROUP BY `string`;

```

I want to get here, via MySQL if possible:

```
string    low    high
=====================
abc         1      20
def         2       6

```