ベストセラーフォーマットのクエリが正しく機能していない

Question

データベースに「ベストセラーのストックフォーマットは何ですか？」という質問をしています。以下に、サンプルデータとデータベースそのものを構成するコードを示します。私はデータベースを作成するためにphpMyadminを使用しているので、これはMyadminのデータダンプです。

CREATE TABLE IF NOT EXISTS `tbl_sale` (
`id_sale` int(11) NOT NULL AUTO_INCREMENT, 
`id_stock` int(11) NOT NULL, 
`id_customer` int(11) NOT NULL, 
`id_employee` int(11) NOT NULL, 
`id_invoice` int(11) NOT NULL, 
PRIMARY KEY (`id_sale`) 
) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=32 ; 

INSERT INTO `tbl_sale` (`id_sale`, `id_stock`,`id_customer`,`id_employee`, `id_invoice`) VALUES 
(2, 2, 1, 1, 1), 
(3, 1, 1, 1, 1), 
(4, 3, 1, 1, 1), 
(5, 4, 2, 2, 2), 
(6, 5, 2, 2, 2), 
(7, 6, 3, 3, 3), 
(8, 7, 4, 4, 4), 
(9, 8, 4, 5, 4), 
(10, 9, 4, 5, 4), 
(11, 10, 4, 6, 4), 
(12, 11, 5, 7, 5), 
(13, 12, 5, 7, 5), 
(14, 13, 6, 8, 6), 
(15, 14, 6, 8, 6), 
(16, 15, 6, 8, 6), 
(17, 16, 7, 9, 7), 
(18, 17, 8, 10, 8), 
(19, 18, 8, 10, 8), 
(20, 19, 9, 1, 9), 
(21, 20, 9, 1, 9), 
(22, 21, 9, 1, 9), 
(23, 22, 9, 1, 9), 
(24, 1, 10, 2, 10), 
(25, 2, 11, 3, 11), 
(26, 3, 12, 4, 12), 
(27, 4, 12, 4, 12), 
(28, 5, 13, 5, 13), 
(29, 6, 14, 6, 14), 
(30, 7, 15, 7, 15), 
(31, 8, 16, 7, 16); 

CREATE TABLE IF NOT EXISTS `tbl_stock` (
`id_stock` int(11) NOT NULL AUTO_INCREMENT, 
`name` varchar(25) NOT NULL, 
`quantity` int(11) NOT NULL, 
`price_cost` decimal(10,2) NOT NULL, 
`price_sale` decimal(10,2) NOT NULL, 
`weight` int(25) NOT NULL, 
`id_format` int(11) NOT NULL, 
`id_genre` int(11) NOT NULL, 
PRIMARY KEY (`id_stock`) 
) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=23 ; 

INSERT INTO `tbl_stock` (`id_stock`, `name`, `quantity`, `price_cost`,`price_sale`, `weight`, `id_format`, `id_genre`) VALUES 
(1, 'Star Wars: The Force Awak', 10, 2.39, 10.00, 16, 1, 1), 
(2, 'The Hunger Games: Mocking', 15, 2.28, 11.00, 16, 3, 2), 
(3, 'Deadpool', 20, 4.00, 15.99, 16, 1, 14), 
(4, 'The Jungle Book', 10, 1.78, 13.99, 16, 1, 1), 
(5, 'Captain America: Civil Wa', 13, 2.59, 12.99, 16, 3, 1), 
(6, 'Batman v Superman: Dawn o', 15, 2.99, 14.99, 16, 3, 14), 
(7, 'The Huntsman: Winter''s Wa', 14, 2.99, 13.00, 16, 1, 5), 
(8, 'The Magnificent Seven', 10, 1.36, 11.99, 16, 1, 16), 
(9, 'Hardcore Henry', 5, 1.24, 10.99, 16, 3, 18), 
(10, 'Doctor Strange', 8, 2.54, 14.99, 16, 1, 2), 
(11, 'Power Rangers ', 9, 0.97, 13.99, 16, 3, 14), 
(12, '10 Cloverfield Lane', 5, 1.34, 12.99, 16, 3, 10), 
(13, 'Star Wars Battlefront', 10, 8.49, 29.50, 100, 6, 18), 
(14, 'Quantum Break', 20, 15.78, 38.61, 100, 6, 18), 
(15, 'Call of Duty: Black Ops I', 12, 9.89, 30.00, 100, 5, 18), 
(16, 'One Voice', 5, 1.52, 9.99, 58, 2, 21), 
(17, 'NOW That''s What I Call Mu', 3, 1.29, 13.00, 55, 2, 21), 
(18, 'Ratchet and Clank', 10, 7.89, 28.00, 100, 6, 17), 
(19, 'Uncharted 4: A Theif''s En', 10, 7.89, 44.00, 100, 6, 18), 
(20, 'Dark Sould III', 10, 9.99, 38.99, 100, 5, 19), 
(21, 'Grand Theft Auto V', 12, 11.99, 37.49, 100, 5, 20), 
(22, 'FIFA 16', 7, 5.89, 34.95, 100, 6, 21); 

CREATE TABLE IF NOT EXISTS `tbl_stock_format` (
`id_format` int(11) NOT NULL AUTO_INCREMENT, 
`format` varchar(25) NOT NULL, 
    PRIMARY KEY (`id_format`) 
) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=8 ; 

INSERT INTO `tbl_stock_format` (`id_format`, `format`) VALUES 
(1, 'DVD'), 
(2, 'CD'), 
(3, 'Blu-Ray'), 
(4, 'Vinyl'), 
(5, 'Playstation 4'), 
(6, 'Xbox One'); 

私が使用しようとしていますクエリはこれです：

SELECT id_format, MAX(MAX_COUNT) 
FROM(
SELECT id_format, COUNT(id_format) AS MAX_COUNT 
SELECT*FROM tbl_sale, tbl_stock_format 
WHERE tbl_sale.id_format = tbl_stock_format.id_format 
GROUP BY id_format) AS COUNT 

ただしUはこのエラーを取得：

1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'SELECT*FROM tbl_sale, tbl_stock_format WHERE tbl_sale.id_format = tbl_stock_form' at line 4

誰も私が間違ってやっているものを私にしてください教えてください。

Answer 1

このクエリはナンセンスでいっぱいです。テーブルに属していないテーブル列が選択されています：tbl_sale.id_format、構造のない複数の選択クエリがあります。

このクエリを試してみてください。これが正しい結果を出力しない場合は、あなたが示したものよりはるかに良いスタートです。

SELECT tbl_stock_format.id_format, tbl_stock_format.format, COUNT(tbl_stock_format.id_format) AS count 
FROM tbl_stock_format 
INNER JOIN tbl_stock 
ON tbl_stock.id_format = tbl_stock_format.id_format 
INNER JOIN tbl_sale 
ON tbl_sale.id_stock = tbl_stock.id_stock 
GROUP BY tbl_stock_format.id_format 
ORDER BY count DESC