獲取產品及其變體

Question

我需要幫助請一個查詢。我需要一個能夠從表格中獲取產品或變體的查詢。所以，如果我需要的產品 「一個」，產品 「A1」 的 「b」 + 變化。外觀查詢將如何？ 我需要得到從表和到最後產品的三種產品（ID爲：a）與具有修飾的價值（價格，質量，銷售）取代

這裏是例如表和行：

products 
------------------ 
CREATE TABLE IF NOT EXISTS `products` (
    `id` varchar(10) NOT NULL, 
    `hidden` tinyint(1) NOT NULL, 
    `only_variations` int(1) NOT NULL DEFAULT '0', 
    `price` decimal(20,6) NOT NULL, 
    `weight_in_package` int(11) NOT NULL COMMENT 'mg', 
    `stock_pieces` int(11) NOT NULL, 
    `gifts` text NOT NULL, 
    `rating` int(11) NOT NULL, 
    `sold_pieces` int(11) NOT NULL, 
    `brand` int(11) NOT NULL, 
    `deleted` int(1) NOT NULL, 
    PRIMARY KEY (`id`) 
) ENGINE=MyISAM DEFAULT CHARSET=utf8; 

INSERT INTO `products` (`id`, `hidden`, `only_variations`, `price`, `weight_in_package`, `stock_pieces`, `gifts`, `rating`, `sold_pieces`, `brand`, `deleted`) VALUES 
('a', 0, 0, 12.000000, 50, 10, '', 0, 35, 1, 0), 
('b', 0, 0, 11.000000, 50, 15, '', 0, 22, 2, 0); 


variations 
------ 


CREATE TABLE IF NOT EXISTS `product_variations` (
    `id` varchar(10) COLLATE utf8_bin NOT NULL, 
    `product` varchar(10) COLLATE utf8_bin NOT NULL, 
    `price` decimal(20,6) NOT NULL, 
    `stock_pieces` int(11) NOT NULL, 
    `weight` int(11) NOT NULL COMMENT 'mg', 
    `sales` int(11) NOT NULL, 
    PRIMARY KEY (`id`) 
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin; 


INSERT INTO `product_variations` (`id`, `product`, `price`, `stock_pieces`, `weight`, `sales`) VALUES 
('a1', 'a', 50.000000, 10, 0, 0), 
('a2', 'a', 40.000000, 11, 0, 0); 

而這種輸出我在SQL查詢需要：

id | price | variation 
a  12  NULL 
b  11  NULL 
a  50  a1 

非常感謝您的幫助！

Answer 1

試試這個：http://sqlfiddle.com/#!9/0f128/44/0

SELECT 
*, 
null as `variation` 
FROM `products` WHERE id IN('a', 'b') 

UNION ALL 

(SELECT 

p.id as `id`, 
p.hidden as `hidden`, 
p.only_variations as `only_variations`, 
v.price as `price`, 
p.weight_in_package as `weight_in_package`, 
v.stock_pieces as `stock_pieces`, 
p.gifts as `gifts`, 
p.rating as `rating`, 
p.sold_pieces as `sold_pieces`, 
p.brand as `brand`, 
p.deleted as `deleted`, 
v.id as `variation` 

FROM `product_variations` as v 



LEFT JOIN `products` as p ON p.id = v.product 

WHERE v.id IN('a1')) 
ORDER BY price DESC