Mysql 获取组中最新记录的标题_Mysql_Join

Mysql 获取组中最新记录的标题

mysql join

Mysql 获取组中最新记录的标题,mysql,join,Mysql,Join,我正在进行自联接，我有以下查询： select max( wf1.id ) as latest_id, max( wf1.created ) as latest_created, wf1.id, wf1.created, wf1.title, wf2.id, wf2.created, wf2.title from worksheet_forms wf1 join worksheet_forms wf2 on max( wf1.id )

我正在进行自联接，我有以下查询：

select 
    max( wf1.id ) as latest_id, 
    max( wf1.created ) as latest_created, 
    wf1.id, wf1.created, wf1.title,
    wf2.id, wf2.created, wf2.title
from
    worksheet_forms wf1
join
    worksheet_forms wf2
on
    max( wf1.id ) = wf2.id
where 
    wf1.company_id = '000002'
group by 
    wf1.generated_id

但我有一个错误：

MySQL said: 

#1111 - Invalid use of group function

我想做的是得到表中一组最新记录的标题

编辑：

现在，我想要一个结果：

+-----------------------------------------------------------------------+
|  id |   generated_id  |  company_id  |  title  |      created         |
+-----------------------------------------------------------------------+
|  3  |  aaajdfie34343  |    000002    |   ws3   | 2012-02-10 17:27:30  |
|  7  |  bbbjdfie34343  |    000002    |   ws7   | 2012-02-14 17:27:30  |
|  9  |  cccjdfie34343  |    000002    |   ws9   | 2012-02-16 17:27:30  |
+-----------------------------------------------------------------------+

很好，这更容易理解。运行此：

select t1.* from t t1
left join t t2
on t1.generated_id = t2.generated_id and t1.created < t2.created
where t2.created is null

从t1中选择t1.*
左连接t2
在t1.generated_id=t2.generated_id和t1.created


您将得到以下结果：
+----+---------------+------------+-------+-----------------------+
| ID | GENERATED_ID  | COMPANY_ID | TITLE |        CREATED        |
+----+---------------+------------+-------+-----------------------+
|  3 | aaajdfie34343 |     000002 | ws3   |  2012-02-10 17:27:30  |
|  7 | bbbjdfie34343 |     000002 | ws7   |  2012-02-14 17:27:30  |
|  9 | cccjdfie34343 |     000002 | ws9   |  2012-02-16 17:27:30  |
+----+---------------+------------+-------+-----------------------+
+----+---------------+------------+-------+-----------------------+
|ID |生成的|公司ID |头衔|创建的|
+----+---------------+------------+-------+-----------------------+
|3 | aaajdfie34343 | 000002 | ws3 | 2012-02-10 17:27:30|
|7 | bbbjdfie34343 | 000002 | ws7 | 2012-02-14 17:27:30|
|9 | cccjdfie34343 | 000002 | ws9 | 2012-02-16 17:27:30|
+----+---------------+------------+-------+-----------------------+
只需选择您感兴趣的字段。@MiD如果您以表格格式发布当前数据和预期结果，将更容易理解问题。共享您的表格数据，我们将进一步帮助您感谢您的回复！我用表格数据和预期结果更新了我的问题。
+----+---------------+------------+-------+-----------------------+
| ID | GENERATED_ID  | COMPANY_ID | TITLE |        CREATED        |
+----+---------------+------------+-------+-----------------------+
|  3 | aaajdfie34343 |     000002 | ws3   |  2012-02-10 17:27:30  |
|  7 | bbbjdfie34343 |     000002 | ws7   |  2012-02-14 17:27:30  |
|  9 | cccjdfie34343 |     000002 | ws9   |  2012-02-16 17:27:30  |
+----+---------------+------------+-------+-----------------------+