具有 5 个表的复杂 SQL 联接

Question

我正在开发一个相对庞大的应用程序，其中包含相当多的表。我必须编写一个 SQL 查询，它在简化后涉及 5 个表（有关连接，请参见 jpg）。

想法如下：人有地址，地址有类型（私人、专业等）和国家。人也可以有选择。这些选项（此处在带有 name_id 的选项表中说明）可以链接到地址类型。

这个想法是提取所有拥有一个或多个地址的人，这些地址由一个国家指定，并且他们也出现在 [option address] 表中。

例如，假设我们想要地址为 country_id=1 的人。结果集必须排除与其选项链接的地址类型不同的人员。

嗯...我不确定我是否了解自己 :)

但无论如何，这是创建所有内容的 SQL。

CREATE TABLE `address` (
  `person_id` int(11) NOT NULL,
  `type_id` int(11) NOT NULL,
  `country_id` int(11) NOT NULL,
  UNIQUE KEY `apt` (`person_id`,`type_id`),
  KEY `apid` (`person_id`),
  KEY `atid` (`type_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

INSERT INTO `address` (`person_id`, `type_id`, `country_id`) VALUES
(1, 1, 1),
(2, 2, 1),
(3, 1, 1),
(3, 2, 2),
(5, 1, 2),
(6, 2, 1),
(7, 1, 1),
(7, 2, 2),
(8, 1, 1),
(9, 2, 1);

CREATE TABLE `address_type` (
  `id` int(11) NOT NULL,
  UNIQUE KEY `tid` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

INSERT INTO `address_type` (`id`) VALUES
(1),
(2);

CREATE TABLE `option` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name_id` int(11) NOT NULL,
  `person_id` int(11) NOT NULL,
  UNIQUE KEY `oid` (`id`),
  UNIQUE KEY `onp` (`name_id`,`person_id`),
  KEY `opid` (`person_id`),
  KEY `on` (`name_id`)
) ENGINE=InnoDB  DEFAULT CHARSET=utf8 AUTO_INCREMENT=9 ;

INSERT INTO `option` (`id`, `name_id`, `person_id`) VALUES
(1, 1, 1),
(2, 1, 2),
(3, 1, 3),
(4, 1, 5),
(5, 1, 6),
(6, 1, 7),
(7, 1, 8),
(8, 1, 9);

CREATE TABLE `option_address_type` (
  `option_id` int(11) NOT NULL,
  `type_id` int(11) NOT NULL,
  UNIQUE KEY `ot` (`option_id`,`type_id`),
  KEY `ooid` (`option_id`),
  KEY `otid` (`type_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

INSERT INTO `option_address_type` (`option_id`, `type_id`) VALUES
(1, 1),
(2, 2),
(3, 1),
(3, 2),
(4, 2),
(5, 1),
(6, 1),
(7, 1),
(7, 2),
(8, 1),
(8, 2);

CREATE TABLE `person` (
  `id` int(11) NOT NULL,
  UNIQUE KEY `pid` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

INSERT INTO `person` (`id`) VALUES
(1),
(2),
(3),
(4),
(5),
(6),
(7),
(8),
(9);


ALTER TABLE `address`
  ADD CONSTRAINT `address_ibfk_1` FOREIGN KEY (`person_id`) REFERENCES `person` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
  ADD CONSTRAINT `address_ibfk_2` FOREIGN KEY (`type_id`) REFERENCES `address_type` (`id`) ON DELETE CASCADE ON UPDATE CASCADE;

ALTER TABLE `option`
  ADD CONSTRAINT `option_ibfk_1` FOREIGN KEY (`person_id`) REFERENCES `person` (`id`) ON DELETE CASCADE ON UPDATE CASCADE;

ALTER TABLE `option_address_type`
  ADD CONSTRAINT `option_address_type_ibfk_1` FOREIGN KEY (`option_id`) REFERENCES `option` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
  ADD CONSTRAINT `option_address_type_ibfk_2` FOREIGN KEY (`type_id`) REFERENCES `address_type` (`id`) ON DELETE CASCADE ON UPDATE CASCADE;

Answer 1

那这个呢：

select person_id
from   address adr
,      `option` opt
,      option_address_type opt_adt
where  adr.country_id = 1
and    opt.person_id = adr.person_id
and    opt_adt.option_id = opt.option_id
and    opt_adt.type_id = adr.type_id

或者

select person_id
from   address adr
inner join   `option` opt
  on     opt.person_id = adr.person_id
  and    adr.country_id = 1
inner join    option_address_type opt_adt
  on      opt_adt.option_id = opt.option_id
  and    opt_adt.type_id = adr.type_id