1066 - 不是唯一的表/别名：'artists'

Question

 select * from `appointments` 
 inner join `artists` 
 on `appointments`.`artist_id` = `artists`.`id` 
 inner join `artists` 
 on `appointments`.`client_id` = `artists`.`id`

我无法弄清楚这一点，我需要在同一个表上使用不同的参数与其他表的唯一ID进行两次联接。

Answer 1

您需要表别名：

select *
from appointments ap inner join
     artists aa
     on ap.artist_id = aa.id inner join
     artists ac
     on ap.client_id = ac.id;