这是我的简化数据库方案

-- -----------------------------------------------------

-- Table `products`

-- -----------------------------------------------------

CREATE TABLE IF NOT EXISTS `products` (

`id` INT NULL AUTO_INCREMENT,

`name` VARCHAR(45) NULL,

PRIMARY KEY (`id`))

ENGINE = InnoDB;

-- -----------------------------------------------------

-- Table `properties`

-- -----------------------------------------------------

CREATE TABLE IF NOT EXISTS `properties` (

`id` INT NOT NULL AUTO_INCREMENT,

`product_id` INT NULL,

`key` VARCHAR(45) NULL,

`value` VARCHAR(45) NULL,

PRIMARY KEY (`id`))

ENGINE = InnoDB;

-- -----------------------------------------------------

-- Data for table `products`

-- -----------------------------------------------------

INSERT INTO `products` (`id`, `name`) VALUES (1, 'English Book with AudioCD');

INSERT INTO `products` (`id`, `name`) VALUES (2, 'Polish Book');

-- -----------------------------------------------------

-- Data for table `properties`

-- -----------------------------------------------------

INSERT INTO `properties` (`id`, `product_id`, `key`, `value`) VALUES (1, 1, 'Format', 'Book');

INSERT INTO `properties` (`id`, `product_id`, `key`, `value`) VALUES (2, 1, 'Format', 'Audio');

INSERT INTO `properties` (`id`, `product_id`, `key`, `value`) VALUES (3, 2, 'Format', 'Book');

INSERT INTO `properties` (`id`, `product_id`, `key`, `value`) VALUES (4, 1, 'Language', 'English');

INSERT INTO `properties` (`id`, `product_id`, `key`, `value`) VALUES (5, 2, 'Language', 'Polish');

这里有表格表示

+----+--------------------------+

| id | name |

+----+--------------------------+

| 1 | English Book wit AudioCD |

| 2 | Polish Book |

+----+--------------------------+

+----+------------+----------+---------+

| id | product_id | key | value |

+----+------------+----------+---------+

| 1 | 1 | Format | Book |

| 2 | 1 | Format | AudioCD |

| 3 | 2 | Format | Book |

| 4 | 1 | Language | English |

| 5 | 2 | Language | Polish |

+----+------------+----------+---------+

我需要选择所有具有键“格式”且值为“Book”和“AudioCD”的产品.但我只需要满足所有这些条件的产品.所以我只想要product_id 1而不是2(因为它没有AudioCD).另外我想要也可以添加语言键.

没有多个JOINS,有没有办法做到这一点？

多个JOINS的问题开始于我可以说20-30个键值属性的组合,因为它们将被自由添加.

感谢任何提示！