Among all the customers in Germany, how many of them have an account balance of over 1000?
Germany is the name of the nation which refers to n_name = 'GERMANY'; account balance of over 1000 refers to c_acctbal > 1000;
SELECT COUNT(T1.c_custkey) FROM customer AS T1 INNER JOIN nation AS T2 ON T1.c_nationkey = T2.n_nationkey WHERE T2.n_name = 'GERMANY' AND T1.c_acctbal > 1000