I am very new to the SQL, and I have a table with id (question id) and risk areas (risk1, risk2, and risk3). 

```
+----+-------+------+------+
| id | risk1 | risk2| risk3|
+----+-------+------+------+
| 0  |   h   |   l  |   h  |
| 1  |   m   |   l  |   l  |
| 2  |   h   |   h  |   h  |
| 3  |   l   |   l  |   h  |
+----+-------+------+------+

```

My aim is to calculate the sum of 'h' for individual ids. For example the query should return '2' for id=0, '0' for id=1, '3' for id=2, and '1' for id=3. Any suggestion will be appreciated.