5.sql

select n_name, sum(l_extendedprice * (1 - l_discount)) as revenue from CUSTOMER, ORDERS, LINEITEM, SUPPLIER, NATION, REGION where c_custkey = o_custkey and l_orderkey = o_orderkey and l_suppkey = s_suppkey and c_nationkey = s_nationkey and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'MIDDLE EAST' and o_orderdate >= date '1994-01-01' and o_orderdate < date '1994-01-01' + interval '1' year group by n_name order by revenue desc;