What is the most a book has been sold for?
CREATE TABLE `volume` (
`inventory_id` int(11) NOT NULL,
`ISBN` char(17) DEFAULT NULL,
`condition_code` int(11) DEFAULT NULL,
`date_acquired` date DEFAULT NULL,
`asking_price` decimal(7,2) DEFAULT NULL,
`selling_price` decimal(7,2) DEFAULT NULL,
`sale_id` int(11) DEFAULT NULL
);
INSERT INTO `volume` (`inventory_id`, `ISBN`, `condition_code`, `date_acquired`, `asking_price`, `selling_price`, `sale_id`) VALUES
(1, '978-1-11111-111-1', 3, '2019-06-12', '175.00', '175.00', 1),
(2, '978-1-11111-131-1', 4, '2019-01-23', '50.00', '50.00', 1),
(3, '978-1-11111-133-1', 2, '2018-04-05', '300.00', '285.00', 1),
(4, '978-1-11111-142-1', 1, '2018-05-05', '25.95', '25.95', 2),
(5, '978-1-11111-146-1', 1, '2018-05-05', '22.95', '22.95', 2),
(6, '978-1-11111-144-1', 2, '2019-05-15', '80.00', '76.10', 2),
(7, '978-1-11111-137-1', 2, '2019-06-20', '80.00', NULL, NULL),
(8, '978-1-11111-137-1', 3, '2019-06-20', '50.00', NULL, NULL),
(9, '978-1-11111-136-1', 1, '2018-12-20', '75.00', NULL, NULL),
(10, '978-1-11111-136-1', 2, '2018-12-15', '50.00', NULL, NULL),
(11, '978-1-11111-143-1', 1, '2019-04-05', '25.00', '25.00', 3),
(12, '978-1-11111-132-1', 1, '2019-06-12', '15.00', '15.00', 3),
(13, '978-1-11111-133-1', 3, '2019-04-20', '18.00', '18.00', 3),
(14, '978-1-11111-121-1', 2, '2019-04-20', '110.00', '110.00', 3),
(15, '978-1-11111-121-1', 2, '2019-04-20', '110.00', '110.00', 5),
(16, '978-1-11111-121-1', 2, '2019-04-20', '110.00', NULL, NULL),
(17, '978-1-11111-124-1', 2, '2020-01-12', '75.00', NULL, NULL),
(18, '978-1-11111-146-1', 1, '2019-05-11', '30.00', '30.00', 6),
(19, '978-1-11111-122-1', 2, '2019-05-06', '75.00', '75.00', 6),
(20, '978-1-11111-130-1', 2, '2019-04-20', '150.00', '120.00', 6),
(21, '978-1-11111-126-1', 2, '2019-04-20', '110.00', '110.00', 6),
(22, '978-1-11111-139-1', 2, '2019-05-16', '200.00', '170.00', 6),
(23, '978-1-11111-125-1', 2, '2019-05-16', '45.00', '45.00', 7),
(24, '978-1-11111-131-1', 3, '2019-04-20', '35.00', '35.00', 7),
(25, '978-1-11111-126-1', 2, '2019-11-16', '35.00', '55.00', 8),
(27, '978-1-11111-141-1', 1, '2019-11-06', '24.95', NULL, NULL),
(28, '978-1-11111-141-1', 1, '2019-11-06', '24.95', NULL, NULL),
(29, '978-1-11111-141-1', 1, '2019-11-06', '24.95', NULL, NULL),
(30, '978-1-11111-145-1', 1, '2019-11-06', '27.95', NULL, NULL),
(31, '978-1-11111-145-1', 1, '2019-11-06', '27.95', NULL, NULL),
(32, '978-1-11111-145-1', 1, '2019-11-06', '27.95', NULL, NULL),
(33, '978-1-11111-139-1', 2, '2019-11-06', '75.00', '50.00', 9),
(34, '978-1-11111-133-1', 1, '2019-11-16', '125.00', '125.00', 10),
(35, '978-1-11111-126-1', 1, '2019-10-06', '75.00', '75.00', 11),
(36, '978-1-11111-130-1', 3, '2018-12-06', '50.00', '50.00', 11),
(37, '978-1-11111-136-1', 3, '2018-12-06', '75.00', '75.00', 11),
(38, '978-1-11111-130-1', 2, '2019-04-06', '200.00', '150.00', 12),
(39, '978-1-11111-132-1', 3, '2019-04-06', '75.00', '75.00', 12),
(40, '978-1-11111-129-1', 1, '2012-04-06', '25.95', '25.95', 13),
(41, '978-1-11111-141-1', 1, '2019-05-16', '40.00', '40.00', 14),
(42, '978-1-11111-141-1', 1, '2019-05-16', '40.00', '40.00', 14),
(43, '978-1-11111-132-1', 1, '2019-11-12', '17.95', NULL, NULL),
(44, '978-1-11111-138-1', 1, '2019-11-12', '75.95', NULL, NULL),
(45, '978-1-11111-138-1', 1, '2019-11-12', '75.95', NULL, NULL),
(46, '978-1-11111-131-1', 3, '2019-11-12', '15.95', NULL, NULL),
(47, '978-1-11111-140-1', 3, '2019-11-12', '25.95', NULL, NULL),
(48, '978-1-11111-123-1', 2, '2019-08-16', '24.95', NULL, NULL),
(49, '978-1-11111-127-1', 2, '2019-08-16', '27.95', NULL, NULL),
(50, '978-1-11111-127-1', 2, '2020-01-06', '50.00', '50.00', 15),
(51, '978-1-11111-141-1', 2, '2020-01-06', '50.00', '50.00', 15),
(52, '978-1-11111-141-1', 2, '2020-01-06', '50.00', '50.00', 16),
(53, '978-1-11111-123-1', 2, '2020-01-06', '40.00', '40.00', 16),
(54, '978-1-11111-127-1', 2, '2020-01-06', '40.00', '40.00', 16),
(55, '978-1-11111-133-1', 2, '2020-02-06', '60.00', '60.00', 17),
(56, '978-1-11111-127-1', 2, '2019-02-16', '40.00', '40.00', 17),
(57, '978-1-11111-135-1', 2, '2019-02-16', '40.00', '40.00', 18),
(58, '978-1-11111-131-1', 2, '2020-02-16', '25.00', '25.00', 18),
(59, '978-1-11111-127-1', 2, '2020-02-25', '35.00', '35.00', 18),
(60, '978-1-11111-128-1', 2, '2019-12-16', '50.00', '45.00', 19),
(61, '978-1-11111-136-1', 3, '2019-10-22', '50.00', '50.00', 19),
(62, '978-1-11111-115-1', 2, '2019-10-22', '75.00', '75.00', 20),
(63, '978-1-11111-130-1', 2, '2019-07-16', '500.00', NULL, NULL),
(64, '978-1-11111-136-1', 2, '2019-03-06', '125.00', NULL, NULL),
(65, '978-1-11111-136-1', 2, '2019-03-06', '125.00', NULL, NULL),
(66, '978-1-11111-137-1', 2, '2019-03-06', '125.00', NULL, NULL),
(67, '978-1-11111-137-1', 2, '2019-03-06', '125.00', NULL, NULL),
(68, '978-1-11111-138-1', 2, '2019-03-06', '125.00', NULL, NULL),
(69, '978-1-11111-138-1', 2, '2019-03-06', '125.00', NULL, NULL),
(70, '978-1-11111-139-1', 2, '2019-03-06', '125.00', NULL, NULL),
(71, '978-1-11111-139-1', 2, '2019-03-06', '125.00', NULL, NULL);
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