Question

Mysql返回未知列＆＃34; users.status＆＃34;在＆＃34; where子句＆＃34;

    SELECT
    users.firstname,
    users.lastname,
    users.email,
    users.pref
   FROM (
    SELECT
        users.firstname,
        users.lastname,
        users.email,
        CONCAT(
            users.preference, ',',
        ) AS pref
    FROM users
) AS users

  WHERE  users.status = 1
  AND users.active = 1

Answer 1

子查询不包含status列。为什么不在没有子查询的情况下编写查询？

SELECT u.firstname, u.lastname, u.email,
       CONCAT(u.preference, ',') AS pref
FROM users u
WHERE u.status = 1 AND u.active = 1;

你在CONCAT()的末尾还有一个额外的逗号（看起来很奇怪，只有两个参数）。

选择查询中的mysql unknown列为

1 个答案: