需要在sql server中創建動態數據透視表

Question

我有下面的查詢，它運行良好，但它的靜態數據透視表。我想動態創建它。我想知道這段代碼需要什麼修改，以便我可以把它變成動態的關鍵。 提前致謝！

select * from 
    (
select g.NationalityName_1,DepartmentName_1,h.EmployeeID from HR_Department hr 
      join 
HR_EmploymentInformation h 
    on h.DepartmentID=hr.DepartmentID 
     join 
HR_EmployeeDetail e 
    on e.EmployeeID=h.EmployeeID 
     join 
GEN_Nationality g 
    on g.NationalityID=e.DefaultNationalityID 
) as fev 
pivot 
(
    count(employeeId) 
    for departmentname_1 in (Administration,Academia,[New Department 1],[New Department 2],[New Department 3],[New Department 5]) 
) as pvt 

這是輸出：

NationalityName_1 Administration Academia New Department 1 New Department 2 New Department 3 New Department 5 
Algeria     0   1   0     0     0     0 

這是上面的查詢和正確的輸出，我面臨的問題是，如果我創建一個新的部門我不得不再次改變一個我不想要的代碼。

Answer 1

試試這個：我們可以通過以下方式

DECLARE @col VARCHAR(1000) 
DECLARE @sql VARCHAR(2000) 

SELECT @col = COALESCE(@col + ', ','') + QUOTENAME(DepartmentName_1) 
FROM HR_Department hr 
JOIN HR_EmploymentInformation h ON h.DepartmentID = hr.DepartmentID 
JOIN HR_EmployeeDetail e ON e.EmployeeID = h.EmployeeID 
JOIN GEN_Nationality g ON g.NationalityID = e.DefaultNationalityID 

SET @sql = ' 
    SELECT NationalityName_1, ' + @col + ' 
    FROM 
     (SELECT g.NationalityName_1, 
      DepartmentName_1, 
      h.EmployeeID 
     FROM HR_Department hr 
     JOIN HR_EmploymentInformation h ON h.DepartmentID = hr.DepartmentID 
     JOIN HR_EmployeeDetail e ON e.EmployeeID = h.EmployeeID 
     JOIN GEN_Nationality g ON g.NationalityID = e.DefaultNationalityID 
     ) AS fev 
    PIVOT 
    (
     COUNT(employeeId) 
     FOR departmentname_1 IN (' + @col + ') 
    ) AS pvt' 

EXEC (@sql)