Question

我希望下面的错误是自我解释的。我想将event_time与几个cart_time进行比较。我知道通常当我们想要这样的任何操作时我们需要使用in但是对于时间戳如何比较它< / p>

 mysql> SELECT bsid
        FROM access_aug15
        WHERE event_time < (SELECT cart_time 
                            FROM chat_final 
                            WHERE bsid in (SELECT bsid  
                                           FROM access_aug15
                                           WHERE eventid="11"
                                           AND current_page not like  '%cart%'));

 ERROR 1242 (21000): Subquery returns more than 1 row

编辑：表格结构access_aug15

  +-------------------+--------------+------+-----+---------+-------+
  | Field             | Type         | Null | Key | Default | Extra |
  +-------------------+--------------+------+-----+---------+-------+
  | vid               | varchar(200) | YES  |     | NULL    |       |
  | bsid              | varchar(200) | YES  | MUL | NULL    |       |
  | event_time        | datetime     | YES  | MUL | NULL    |       |
  | eventid           | varchar(10)  | YES  | MUL | NULL    |       |
  | current_page      | mediumtext   | YES  |     | NULL    |       |
  | departmentid      | varchar(100) | YES  | MUL | NULL    |       |
  | form_id           | varchar(100) | YES  |     | NULL    |       |
  | form_name         | varchar(100) | YES  |     | NULL    |       |
  | page_title        | varchar(200) | YES  |     | NULL    |       |
  | report_date       | datetime     | YES  | MUL | NULL    |       |
  +-------------------+--------------+------+-----+---------+-------+

表2：chat_final

  +-------------------+--------------+------+-----+---------+-------+
  | Field             | Type         | Null | Key | Default | Extra |
  +-------------------+--------------+------+-----+---------+-------+
  | bsid              | varchar(200) | YES  | MUL | NULL    |       |
  | chat_time         | datetime     | YES  |     | NULL    |       |
  | cart_time         | datetime     | YES  |     | NULL    |       |
  | customerid        | varchar(100) | YES  |     | NULL    |       |
  | detail            | longtext     | YES  |     | NULL    |       |
  | chat_type         | varchar(5)   | YES  |     | NULL    |       |
  +-------------------+--------------+------+-----+---------+-------+

Answer 1

在您的查询子查询（在另一个查询中查询）应该只返回一个结果..但它返回多行。您需要修改子查询。请提供表格结构和一些数据...然后我会给你正确的查询

Answer 2

select bsid from access_aug15 where event_time <(select cart_time from chat_final 
 where bsid in (select bsid from access_aug15 
 where eventid="11"  and current_page not like  '%cart%' 
 LIMIT 1) 
 LIMIT 1);

时间戳的mysql查询错误

2 个答案: