Question

我正在尝试在查询中使用JOIN而无法弄清楚为什么我会得到

SQL命令未正确结束

错误。这是我正在尝试运行的查询：

select 
    v.contid, v.group_id, a.user_id 
from 
    application_users a, web_users v
where 
    a.is_active = 1
    and v.group_id in (22, 26, 595, 635)
    and a.user_id = v.user_id
join 
    contest_results cr on cr.user_id = a.user_id
where 
    cr.period = 201502

Answer 1

这不是JOIN多个表的正确语法。

也不要使用逗号分隔的连接始终使用更具可读性的INNER JOIN语法。试试这个

SELECT v.contid, 
       v.group_id, 
       a.user_id 
FROM   application_users a 
       INNER JOIN web_users v 
               ON a.user_id = v.user_id 
       INNER JOIN contest_results cr 
               ON cr.user_id = a.user_id 
WHERE  cr.period = 201502 
       AND a.is_active = 1 
       AND v.group_id IN ( 22, 26, 595, 635 )

使用连接时SQL命令未正确结束

1 个答案: