我想要每个名称的最小日期的OrderType。
Name Date OrderType
Alex 1/1/2014 Direct
Alex 9/15/2014 Distributor
Cindy 6/4/2014 Distributor
John 5/8/2014 Direct
John 2/14/2014 Distributor
返回这个:
Name Date OrderType
Alex 1/1/2014 Direct
Cindy 6/4/2014 Distributor
John 2/14/2014 Distributor