從表中選擇不同的日期以及其他字段

Question

在表Emplyoee中有兩個字段JoinDate和EmployeeName。

所有數據包含在Emplyoee表如下：

JoinDate  | EmployeeName 
------------------------ 
02-12-2009 Vijay 

03-12-2009 Binoy 

03-12-2009 Rahul 

我的選擇查詢如下：

SELECT DISTINCT JoinDate,EmployeeName FROM Emplyoee 

我得到的結果如下：

JoinDate | EmployeeName 
------------------------ 
02-12-2009 Vijay 
03-12-2009 Binoy 
03-12-2009 Rahul 

但我需要的結果如下：

JoinDate | EmployeeName 
------------------------ 
02-12-2009 Vijay 
03-12-2009 Binoy(first employee joined on this date) 

Answer 1

這將選擇第一個僱員按字母順序是每個加入日期：

SELECT DISTINCT mydates.JoinDate, 
    (SELECT TOP 1 EmployeeName FROM Employee e2 WHERE e2.JoinDate=mydates.JoinDate ORDER BY EmployeeName) 
FROM Employee mydates