從結果集的不同列中的相同列中放置數據

Question

我有一個請求，我不確定要處理。我正在考慮使用PIVOT，但我不確定這是否會走。

我有以下數據：

EmployeeA, DepartmentB, 1/10/2010 
EmployeeA, DepartmentA, 1/1/2000 
EmployeeB, DepartmentC, 1/3/2011 

他們想輸出只有已經在不同部門的員工。看起來像這樣的東西（訂單是重要的，由於日期）：

EmployeeA, DepartmentA, DepartmentB 

任何幫助表示讚賞。出於某種原因，我的頭腦沒有找到一個好的解決方案。

Answer 1

您可以通過對錶做一個自我JOIN，然後用PIVOT以獲得您想要的格式的數據做到這一點：

SELECT * 
FROM 
(
    SELECT t1.emp, t1.dept, t1.dt 
    FROM test t1 
    INNER JOIN test t2 
     ON t1.emp = t2.emp 
     AND t1.dept != t2.dept 
) x 
PIVOT 
(
    min(dt) 
    for dept in ([A], [B], [C], [D], [E]) 
) p 

見SQL Fiddle with Demo

如果您刪除JOIN你會得到所有的記錄，但你說你只想要在多個部門中的記錄。

Answer 2

這是我得到的答案，我主要根據你的工作得到答案。樞軸不起作用，因爲我不知道類別（在本例中是部門），我只能有兩個。

也許有一個更簡單的方法。我沒有使用CTE，因爲我相信這也適用於Sybase，我不認爲它支持這一點。

select Meta1.[Employee ID], 
Meta1.Department as PreviousDepartment, 
Meta2.Department as CurrentDepartment 
from 
(
SELECT t1.[First Name], t1.[Last Name], 
t1.[Employee ID], t1.Department, t1.[Hire Date], 
ROW_NUMBER() over(PARTITION by t1.[EMPLOYEE ID] order by t1.[Hire Date]) as RowNum 
FROM EMPLOYEE t1 
INNER JOIN EMPLOYEE t2 
    ON t1.[Employee ID] = t2.[Employee ID] 
    AND t1.Department != t2.Department 
) Meta1 
inner join 
(
SELECT t1.[Employee ID], t1.Department, t1.[Hire Date], 
ROW_NUMBER() over(PARTITION by t1.[EMPLOYEE ID] order by t1.[Hire Date]) as RowNum 
FROM EMPLOYEE t1 
INNER JOIN EMPLOYEE t2 
    ON t1.[Employee ID] = t2.[Employee ID] 
    AND t1.Department != t2.Department 
) Meta2 
on Meta1.[Employee ID]=Meta2.[Employee ID] 
where Meta1.RowNum=1 
and Meta2.RowNum=2