如何获取MySQL组中的最后一条记录

Question

我需要一些帮助： 假设我有以下记录：

Driver  Date    Consultant
1   1/01/2010   A
1   3/04/2010   A
1   3/04/2010   A
1   25/06/2012  B
2   24/03/2012  C
3   13/01/2012  A
3   15/01/2012  B
3   15/01/1012  C

日期和顾问来自QUOTES表，驱动程序来自DRIVER表。与驱动程序ID相关。

我需要将结果集看起来如下：

Driver  Quote Count First date  Last Date   Consultant
1          4        1/01/2010   25/06/2012  B
2          1        24/03/2012  24/03/2012  C
3          3        13/01/2012  15/01/1012  C

在MySQL中，如何让结果集中的顾问成为最后一位参与QUOTE的顾问？

Answer 1

可以使用显式连接执行此操作：

select q.*, t.consultant
from (select driver, count(*) as quotecount, min(date) as FirstDate, max(date) as lastdate
      from t
      group by driver
     ) q join
     t
     on t.driver = q.driver and t.date = q.lastdate