-- Q10: Returned Item Reporting
-- Operators: 4-table Join -> Filter -> Aggregate
-- TopK: ORDER BY + LIMIT restored (now supported by pg_trickle)
SELECT
    c_custkey,
    c_name,
    SUM(l_extendedprice * (1 - l_discount)) AS revenue,
    c_acctbal,
    n_name,
    c_address,
    c_phone,
    c_comment
FROM customer, orders, lineitem, nation
WHERE c_custkey = o_custkey
  AND l_orderkey = o_orderkey
  AND o_orderdate >= DATE '1993-10-01'
  AND o_orderdate < DATE '1993-10-01' + INTERVAL '3 months'
  AND l_returnflag = 'R'
  AND c_nationkey = n_nationkey
GROUP BY c_custkey, c_name, c_acctbal, c_phone, n_name, c_address, c_comment
ORDER BY revenue DESC
LIMIT 20