使用Excel（或SQL）合并或删除列中的重复值

我有一个查询，我join雇员表和日志表来显示每个员工的日志。 问题是我需要删除那些重复的列值（只显示每个员工的第一行的emp细节）。 有谁知道如何在Excel或SQL Server中做到这一点？

SELECT e.Employee, e.Position, e.Dept, l.Actioner, s.Status, l.ActionDate FROM employee e LEFT JOIN logs l ON e.EmpNo = l.EmpNo INNER JOIN Status s ON l.StatusId = s.Id ORDER BY l.Employee, l.ActionDate 

原始输出

 Employee |Position |Dept |Actioner |Action |ActionDate emp1 |Manager |IT |emp1 |Submit |01/01/2017 emp1 |Manager |IT |emp2 |Verify |01/02/2017 emp1 |Manager |IT |emp3 |Approve |01/03/2017 emp2 |Supervisor |HR |emp2 |Submit |01/12/2017 emp2 |Supervisor |HR |emp3 |Verify |01/13/2017 emp2 |Supervisor |HR |emp4 |Approve |01/14/2017 

期望的输出

 Employee |Position |Dept |Actioner |Action |ActionDate emp1 |Manager |IT |emp1 |Submit |01/01/2017 |emp2 |Verify |01/02/2017 |emp3 |Approve |01/03/2017 emp2 |Supervisor |HR |emp2 |Submit |01/12/2017 |emp3 |Verify |01/13/2017 |emp4 |Approve |01/14/2017 

注：我更喜欢如果这可以使用Excelfunction解决。 谢谢！

Answer 1

以下是2012年之前在SQL Server中执行此操作的一种方法（引入LAG函数时）。

使用ROW_NUMBER的公用表expression式和CASEexpression式仅返回第一个Employee ， Position和Dept ：

 ;WITH CTE AS ( SELECT e.Employee, e.Position, e.Dept, l.Actioner, s.Status, l.ActionDate, ROW_NUMBER() OVER(PARTITION BY e.Employee ORDER BY l.Employee, l.ActionDate) As rn FROM employee e LEFT JOIN logs l ON e.EmpNo = l.EmpNo INNER JOIN Status s ON l.StatusId = s.Id ) SELECT CASE WHEN rn = 1 THEN e.Employee END As Employee, CASE WHEN rn = 1 THEN e.Position END As Position, CASE WHEN rn = 1 THEN e.Dept END As Dept, l.Actioner, s.Status, l.ActionDate FROM CTE ORDER BY l.Employee, l.ActionDate