Question

我想选择所有昨天创建内容的成员

TABLE用户

userid   firstname    lastname
1         JOHN         DEO
2         JANE         DEO

表格信息

msg_id  msg_from   msg_to     received  age  city  country   timestamp
1       userid(1)  userid(2)  null      26   any   any       2018-10-04 14:37:12

查询

 SELECT
  SND.userid,
  SND.firstname,
  SND.lastname,
  M.age,
  M.city,
  M.country
FROM
  msg as M
  LEFT JOIN users as SND ON SND.userid = M.msg_from
WHERE
  M.timestamp >= (CURDATE() - INTERVAL 1 DAY);

我想选择所有昨天创建内容的成员

Answer 1

尝试一下：

SELECT SND.userid, 
       SND.firstname, 
       SND.lastname, 
       M.age, 
       M.city, 
       M.country
   FROM msg as M
     LEFT JOIN users as SND ON SND.userid = M.msg_from
   WHERE M.timestamp >= ( CURDATE() - INTERVAL 1 DAY );

您需要与表别名保持一致。

附注：我没有检查您查询的WHERE子句。

Answer 2

终于解决了。我对整个查询和表都有疑问

使用mysql join选择所有成员

2 个答案: