获取产品及其变体

Posted 2023-02-16

【中文标题】获取产品及其变体

【英文标题】：Get products and their variants

【发布时间】：2015-04-12 20:05:21

【问题描述】：

我需要一个查询的帮助。我需要一个从表中获取产品或变体的查询。所以，如果我需要产品“a”、“b”+产品变体“a1”。外观将如何查询？ 我需要从表格和最后一个产品（ID：a）中获取三个产品并替换为修改后的值（价格、重量、销售额）

这是表格和行的示例：

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);

我在 sql 查询中需要这个输出：

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

非常感谢您的帮助！

【问题讨论】：

SELECT `id`, `price`, null as `variation` FROM `products` UNION SELECT `product` as `id`, `price`, `id` as `variation` FROM `product_variations` WHERE `id` = 'a1'?- sqlfiddle.com/#!9/0f128/2

【参考方案1】：

试试这个：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