SQl服務器查詢多個聚合列

Question

我需要在sql server中寫一個查詢來獲取數據。

本質上，它是由部門，種族，性別組，然後

SUM(employees_of_race_by_gender),Sum(employees_Of_Dept). 

我能得到前四列的數據，讓員工的總和的部門變得困難。 你能幫我寫下查詢嗎？

所有這些細節在同一張表Emp。電磁脈衝列Emp_Number，Race_Name，性別，部門

Answer 1

你 「num_of_emp_in_race」 實際上是性別太

SELECT DISTINCT 
    Dept, 
    Race_name, 
    Gender, 
    COUNT(*) OVER (PARTITION BY Dept, Race_name, Gender) AS num_of_emp_in_race, 
    COUNT(*) OVER (PARTITION BY Dept) AS num_of_emp_dept 
FROM 
    MyTable 

你或許應該有這種

COUNT(*) OVER (PARTITION BY Dept, Gender) AS PerDeptRace 
    COUNT(*) OVER (PARTITION BY Dept, Race_name) AS PerDeptGender, 
    COUNT(*) OVER (PARTITION BY Dept, Race_name, Gender) AS PerDeptRaceGender, 
    COUNT(*) OVER (PARTITION BY Dept) AS PerDept 

編輯：DISTINCT似乎是在COUNT之前應用（其中would odd based on this）所以試試這個代替

SELECT DISTINCT 
    * 
FROM 
    (
    SELECT 
     Dept, 
     Race_name, 
     Gender, 
     COUNT(*) OVER (PARTITION BY Dept, Race_name, Gender) AS num_of_emp_in_race, 
     COUNT(*) OVER (PARTITION BY Dept) AS num_of_emp_dept 
    FROM 
     MyTable 
    ) foo 

Answer 2

由於您正在尋找的兩種總和基於不同的聚合，因此您需要分別計算它們並加入結果。在這種情況下，我先建選擇給我看不同的結果，因此很容易發現錯誤早期：

SELECT Dept, Gender, race_name, COUNT(*) as num_of_emp_in_race 
FROM Emp 
GROUP BY 1, 2, 3 

SELECT Dept, COUNT(*) as num_of_emp_in_dept 
FROM Emp 
GROUP BY 1 

之後，加入這兩個是非常直截了當：

SELECT * 
FROM (first statement here) as by_race 
JOIN (second statement here) as by_dept ON (by_race.Dept = by_dept.Dept)