Using Case When

Considering the following table, suppose I want to count how many values associated with the same key are greater than 10, what can I do?

SQL> select * from t;

       KEY        VAL
---------- ----------
         1          1
         1          2
         1         10
         1         11
         2          1
         2          2
         2          3
         3         13
         3         33
         3          3

10 rows selected.

If I use the following statement, the problem is it does not show key=2, in which case there are no values greater than 10:

SQL> select key, count(*) from t where val > 10 group by key;

       KEY   COUNT(*)
---------- ----------
         1          1
         3          2

Case when probably is what I want:

SQL> select key, sum(case when val > 10 then 1 else 0 end) from t group by key;

       KEY SUM(CASEWHENVAL>10THEN1ELSE0END)
---------- --------------------------------
         1                                1
         2                                0
         3                                2