SELECT
    C_NAME,
    C_CUSTKEY,
    O_ORDERKEY,
    O_ORDERDATE,
    O_TOTALPRICE,
    SUM(L_QUANTITY)
FROM
    CUSTOMER,
    ORDERS,
    LINEITEM
WHERE
    O_ORDERKEY IN (
        SELECT
            L_ORDERKEY
        FROM
            LINEITEM
        WHERE L_EXTENDEDPRICE :varies
        GROUP BY
            L_ORDERKEY HAVING
                SUM(L_QUANTITY) > 300
    )
    AND C_CUSTKEY = O_CUSTKEY
    AND O_ORDERKEY = L_ORDERKEY
    AND C_ACCTBAL :varies
GROUP BY
    C_NAME,
    C_CUSTKEY,
    O_ORDERKEY,
    O_ORDERDATE,
    O_TOTALPRICE
ORDER BY
    O_TOTALPRICE DESC,
    O_ORDERDATE