Question: What are the total quantities of the items ordered by customer 101660 on 10/5/1995?
SQL: 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