查找和分组最大数据

Question

我有一张桌子（电话），告诉我员工在帐户上花了多长时间 数据如下：

Date            Agent          Talk_Time          Updt_Time
01/10/2013      One            55                 98
01/10/2013      Two            73                 129
01/10/2013      Three          101                84    
02/10/2013      One            65                 99
02/10/2013      Two            87                 122
02/10/2013      Three          130                80    
03/10/2013      One            8                  90
04/10/2013      Two            13                 110
05/10/2013      Three          100                85    
06/10/2013      One            50                 91
07/10/2013      Two            70                 120
08/10/2013      Three          10                 89  

我正在尝试找到员工的MAX谈话和更新时间 我需要的另一个附加功能是查看7天的时间 所以在过去的七天里，数据看起来应该是这样的：

Agent          Talk_Time          Updt_Time
One            65                 99
Two            87                 122
Three          130                89

Answer 1

很简单!!!

select agent,max(Talk_time) as talk_time,max(updt_time) as updt_time from table  group by agent

Answer 2

select agent,max(talk_time) as talk_time,max(updt_time) as updt_time from calls group by agent