What is the total price of all the orders made by customers in Germany?
orders refer to o_orderkey; total price refers to o_totalprice; Germany is the name of the nation which refers to n_name = 'GERMANY';
SELECT SUM(T3.o_totalprice) FROM nation AS T1 INNER JOIN customer AS T2 ON T1.n_nationkey = T2.c_nationkey INNER JOIN orders AS T3 ON T2.c_custkey = T3.o_custkey WHERE T1.n_name = 'GERMANY'