DELETE FROM ORDERS_DTL
WHERE ORDER_NO IN (
    SELECT ORDERS_DTL.ORDER_NO
    FROM ORDERS_DTL
    INNER JOIN ORDERS ON ORDERS_DTL.ORDER_NO = ORDERS.ORDER_NO
    WHERE ORDERS.ORDER_DATE BETWEEN '2010-01-01' AND '2010-12-31'
);
DELETE FROM ORDERS
WHERE ORDER_DATE BETWEEN '2010-01-01' AND '2010-12-31';