MYSQL中Concat结果搜索的问题

Question

您好，这是我试图获得结果的查询，但我如何才能在该列中搜索 concat 结果？

SELECT 
     ( SELECT GROUP_CONCAT(tp.login) 
         FROM tp 
        WHERE tp.user_id = user_extra.user_id
     ) as login
     , users.email as email
     , user_extra.fname as name 
  FROM user_extra 
  LEFT 
  JOIN users 
    ON users.id = user_extra.user_id 
 WHERE users.email like "%example@example.com%" 
    OR user_extra.fname like "%test%" 
    OR tp.login like "%461988%"

Answer 1

您不能在同一范围内引用select 子句中定义的别名（order by 子句除外）。在 MySQL 的最新版本（8.0.14 或更高版本）中，您可以为此使用 lateral：

SELECT tp.login, u.email as email, ue.fname as name 
FROM user_extra ue
LEFT JOIN users u ON u.id = ue.user_id 
LEFT JOIN LATERAL (
    SELECT GROUP_CONCAT(tp.login) login
    FROM tp 
    WHERE tp.user_id = ue.user_id
) tp ON 1
WHERE 
    u.email like '%example@example.com%'
    OR ue.fname like '%test%'
    OR tp.login like '%461988%'

在早期版本中，您可以JOIN，或使用子查询：

SELECT *
FROM (
    SELECT 
        (SELECT GROUP_CONCAT(tp.login) login FROM tp WHERE tp.user_id = ue.user_id) login, 
        u.email as email, 
        ue.fname as name 
    FROM user_extra ue
    LEFT JOIN users u ON u.id = ue.user_id 
) t
WHERE 
    email like '%sradesign.net@gmail.com%'
    OR fname like '%test%'
    OR login like '%461988%'