I have two tables 

```
 myexercise
 id | ex_name | ex_id | owner_id
 1   exercise1    2        1
 2   exercise2    3        1

```

and 

```
exercise
id | ex_name
 2   exercise1
 3   exercise2
 4   exercise3

```

I want to write SQL query that return only rows from EXERCISE TABLE where id isn't in MYEXERCISE table as ex\_id. So it should return only id=>4 and ex\_name=>exercise3.
I think it can be done with JOINS but i don't know how.