What are the total quantities of the items ordered by customer 101660 on 10/5/1995?
total quantity refers to sum(l_quantity); customer 101660 refers to o_custkey = 101660; on 10/5/1995 refers to o_orderdate = '1995-10-05'
SELECT SUM(T2.l_quantity) FROM orders AS T1 INNER JOIN lineitem AS T2 ON T1.o_orderkey = T2.l_orderkey WHERE T1.o_orderdate = '1995-10-05' AND T1.o_custkey = 101660