How many customers who are not in debt ordered an urgent order?
customers who are not in debt refer to c_custkey where c_acctbal > 0; the order is urgent if o_orderpriority = '1-URGENT' ;
SELECT COUNT(T2.c_custkey) FROM orders AS T1 INNER JOIN customer AS T2 ON T1.o_custkey = T2.c_custkey WHERE T2.c_acctbal > 0 AND T1.o_orderpriority = '1-URGENT'