mysql - 同一张表上的多个联接

Question

我的架构是

CREATE TABLE IF NOT EXISTS `account` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(120) NOT NULL,
   PRIMARY KEY (`id`)
 ); 

 CREATE TABLE IF NOT EXISTS `reseller_did` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `phone` int(11) NOT NULL,  
  `superadmin_id` int(11) NOT NULL DEFAULT '0',
  `reseller_id` int(11) NOT NULL DEFAULT '0',
  `admin_id` int(11) NOT NULL DEFAULT '0',
  PRIMARY KEY (`id`),
  FOREIGN KEY (`superadmin_id`) REFERENCES account(`id`),
  FOREIGN KEY (`reseller_id`) REFERENCES account(`id`),
  FOREIGN KEY (`admin_id`) REFERENCES account(`id`)
) 

我想查找手机及其 super 管理员、经销商、管理员名称。问题是我无法使用同一个 id 多次加入。我尝试过的查询

select phone,superadmin_id,reseller_id, admin_id, name from reseller_did join 
account on account.id=reseller_did.admin_id 

上面的查询通过加入 admin_id 显示管理员名称，但是如何获取同一部手机的 super 管理员名称和经销商名称？

编辑:示例输入

账户表

id     name

3      SuperAdmin1
9      Reseller1
10     Admin1

reseller_did

id  phone        superadmin_id   reseller_id   admin_id

1   9090909090   3                 9             10

示例输出

phone        superadmin    reseller    admin

9090909090   SuperAdmin1  Reseller1   Admin1

Answer 1

试试这个；)

select r.phone, a.name as admin, re.name reseller, s.name as superadmin
from reseller_did r
join account a on a.id = r.admin_id
join account s on s.id = r.superadmin_id
join account re on re.id = r.reseller_id

SqlFiddle Result

或者

SELECT r.phone,
       MAX(CASE WHEN a.id = r.admin_id THEN a.name END) as admin,
       MAX(CASE WHEN a.id = r.reseller_id THEN a.name END) as reseller,
       MAX(CASE WHEN a.id = r.superadmin_id THEN a.name END) as superadmin
FROM reseller_did r
INNER JOIN account a 
ON a.id IN (r.admin_id, r.superadmin_id, r.reseller_id)
GROUP BY r.phone

这条sql应该感谢@sagi在这个问题中Get multiple values from another table by different relations .

SqlFiddle Result