与关系的MySQL过滤器查询

Question

我有两个有关系的MySQL表有以下问题： 当我想要一个完整列表或按名称或电子邮件等过滤结果时，我可以轻松查询表1（地址） 。但是现在我需要查询表1并根据表2（兴趣）的关系内容对其进行过滤。所以，我需要找到在表1的行（通常是多行）仅在（或更多）的条件在表2中

在这里会见是表：

CREATE TABLE IF NOT EXISTS `address` (
    `id` int(11) unsigned NOT NULL AUTO_INCREMENT, 
    `name` varchar(100) COLLATE utf8_unicode_ci NOT NULL, 
    `email` varchar(100) COLLATE utf8_unicode_ci NOT NULL, 
    `countryCode` char(2) COLLATE utf8_unicode_ci DEFAULT NULL, 
    `languageCode` char(2) COLLATE utf8_unicode_ci DEFAULT NULL, 
    `timestamp` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, 
    PRIMARY KEY (`id`), 
    UNIQUE KEY `emailUnique` (`email`) 
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci 

INSERT INTO `address` (`id`, `name`, `email`, `countryCode`, `languageCode`, `timestamp`) VALUES 
(1, '', 'dummy@test.com', 'BE', 'nl', '2010-07-16 14:07:00'), 
(2, '', 'test@somewhere.com', 'BE', 'fr', '2010-07-16 14:10:25'); 

CREATE TABLE IF NOT EXISTS `interests` (
    `id` int(10) unsigned NOT NULL AUTO_INCREMENT, 
    `address_id` int(11) unsigned NOT NULL, 
    `cat` char(2) COLLATE utf8_unicode_ci NOT NULL, 
    `subcat` char(2) COLLATE utf8_unicode_ci NOT NULL, 
    `timestamp` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, 
    PRIMARY KEY (`id`), 
    KEY `address_id` (`address_id`) 
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci 

INSERT INTO `interests` (`id`, `address_id`, `cat`, `subcat`, `timestamp`) VALUES 
(1, 1, 'aa', 'xx', '2010-07-16 14:07:00'), 
(2, 1, 'aa', 'yy', '2010-07-16 14:07:00'), 
(3, 2, 'aa', 'xx', '2010-07-16 14:07:00'), 
(4, 2, 'bb', 'zz', '2010-07-16 14:07:00') 
(5, 2, 'aa', 'yy', '2010-07-16 14:07:00'); 

ALTER TABLE `interests` 
    ADD CONSTRAINT `interests_ibfk_1` FOREIGN KEY (`address_id`) REFERENCES `address` (`id`) ON DELETE CASCADE ON UPDATE NO ACTION; 

例如，我需要找到（有）作为兴趣cat = aa和subcat = xx的地址。或者，另一个例子，我需要的地址（猫）同时感兴趣cat = aa和subcat = xx AND cat = aa和subcat = yy。特别是后者是重要的，必须记住地址和兴趣表将是长列表，并且猫/子猫组合的数量将会变化。我现在正在通过Zend_Db_Table（findDependentRowset）处理参考查询，但是解决方法是减慢地址列表的编号，数字为100甚至1000。

谢谢你的帮助。

Answer 1

我又增加了一行在您的利益表格，演示不同的结果这两个例子之间设置：

INSERT INTO interests VALUES (6, 2, 'aa', 'vv', '2010-07-16 14:07:00'); 

那么你可能想使用相关子查询如下尝试：

SELECT * 
FROM address a 
WHERE EXISTS (SELECT id 
       FROM interests 
       WHERE address_id = a.id AND 
         (cat = 'aa' and subcat = 'xx')); 

结果：

+----+------+--------------------+-------------+--------------+---------------------+ 
| id | name | email    | countryCode | languageCode | timestamp   | 
+----+------+--------------------+-------------+--------------+---------------------+ 
| 1 |  | dummy@test.com  | BE   | nl   | 2010-07-16 14:07:00 | 
| 2 |  | test@somewhere.com | BE   | fr   | 2010-07-16 14:10:25 | 
+----+------+--------------------+-------------+--------------+---------------------+ 
2 rows in set (0.00 sec) 

对于第二个例子，我们正在测试的新行先前添加的，为了不具有相同的结果如上：

SELECT * 
FROM address a 
WHERE EXISTS (SELECT id 
       FROM interests 
       WHERE address_id = a.id AND 
         (cat = 'aa' and subcat = 'xx')) AND 
     EXISTS (SELECT id 
       FROM interests 
       WHERE address_id = a.id AND 
         (cat = 'aa' and subcat = 'vv')); 

结果：

+----+------+--------------------+-------------+--------------+---------------------+ 
| id | name | email    | countryCode | languageCode | timestamp   | 
+----+------+--------------------+-------------+--------------+---------------------+ 
| 2 |  | test@somewhere.com | BE   | fr   | 2010-07-16 14:10:25 | 
+----+------+--------------------+-------------+--------------+---------------------+ 
1 row in set (0.00 sec) 

使用相关子查询是很简单的直截了当。但请记住，它在性能方面可能不是最好的，因为相关子查询将针对外部查询中的每个地址执行一次。

Answer 2

SELECT a.name FROM address a 
INNER JOIN interests i ON (a.id = i.address_id) 
WHERE i.cat = "aa" AND i.subcat IN ('xx', 'yy')