MSSQL表查詢問題

Question

有人可以告訴我的方式來獲得使用兩個表之間MSSQL的正確的數據結果如下圖所示

**Person_Table**   **Departemnt_Table** 
===========     ================ 
person_id     depatment_id 
age       department name 
gender       
department_id 

而且，我想要得到的結果如下列：

Department Names, 
Number under 20 aged Males in each department, 
number of under 20 aged Females in each department, 
total number of Males in each department, 
total number of Females in each department and, 
Total number of Persons in each department 

的例子的結果應該出現這樣的

DepartmentName|(Under20)Male|(Under20)Female|Total(M)| Total(F)| Grand Total 
Department1 | 1  | 3   | 1  | 3  | 4 
Department2 | 3  | 1   | 15 | 1  | 16 
Department3 | 0  | 0   | 0  | 0  | 0 

Answer 1

您需要憂色GROUP BY與集合函數條款s。

SELECT DT.DepartmentName, 
     SUM(CASE WHEN PT.age < 20 AND PT.gender='MALE' THEN 1 ELSE 0 END) As [(Under20)Male] 
     ,SUM(CASE WHEN PT.age < 20 AND PT.gender='FEMALE' THEN 1 ELSE 0 END) As [(Under20)FeMale], 
     ,SUM(CASE WHEN PT.gender='MALE' THEN 1 ELSE 0 END) As [Total(M)] 
     ,SUM(CASE WHEN PT.gender='FEMALE' THEN 1 ELSE 0 END) As [Total(F)] 
     ,COUNT(*) As [Grand Total] 
FROM Departemnt_Table DT 
INNER JOIN Person_Table PT ON DT.depatment_id = PT.depatment_id 
GROUP BY DT.DepartmentName 

Answer 2

DECLARE @Person TABLE(person_id int null, 
age int null, 
gender varchar(10) null, 
department_id INT null) 

DECLARE @Department TABLE(
department_id INT, DepartmentName Varchar(200)) 

INSERT INTO @Department VALUES (1,'A') 
INSERT INTO @Department VALUES (2,'B') 
INSERT INTO @Department VALUES (3,'C') 
INSERT INTO @Department VALUES (4,'D') 

INSERT INTO @Person VALUES (1,19,'M',1) 
INSERT INTO @Person VALUES (2,12,'F',1) 
INSERT INTO @Person VALUES (3,30,'M',1) 
INSERT INTO @Person VALUES (4,40,'F',1) 

INSERT INTO @Person VALUES (5,20,'M',2) 
INSERT INTO @Person VALUES (6,12,'F',2) 
INSERT INTO @Person VALUES (7,30,'M',2) 
INSERT INTO @Person VALUES (8,40,'F',2) 

INSERT INTO @Person VALUES (9,20,'M',3) 
INSERT INTO @Person VALUES (10,12,'F',3) 
INSERT INTO @Person VALUES (11,30,'M',3) 
INSERT INTO @Person VALUES (12,40,'F',3) 

INSERT INTO @Person VALUES (13,20,'M', 4) 
INSERT INTO @Person VALUES (14,12,'F',4) 
INSERT INTO @Person VALUES (15,30,'M',4) 
INSERT INTO @Person VALUES (16,17,'F',4) 


Select D.DepartmentName , 
SUM([(Under20)Male]) [(Under20)Male], 
SUM([(Under20)Female])[(Under20)Female], 
SUM([Total(M)]) [Total(M)], 
SUM([ Total(F)]) [ Total(F)], 
SUM([Grand Total]) [Grand Total] 
FROM 

(

Select department_id,COUNT(*) as [(Under20)Male],0 [(Under20)Female],0 [Total(M)],0 [ Total(F)],0 [Grand Total] From @Person WHERE age<20 and gender='M' group by department_id 
Union all 
Select department_id,0 as [(Under20)Male],COUNT(*) [(Under20)Female],0 [Total(M)],0 [ Total(F)],0 [Grand Total] From @Person WHERE age<20 and gender='F' group by department_id 
Union all 
Select department_id,0 as [(Under20)Male],0 [(Under20)Female],COUNT(*) [Total(M)],0 [ Total(F)],0 [Grand Total] From @Person WHERE gender='M' group by department_id 
Union all 
Select department_id,0 as [(Under20)Male],0 [(Under20)Female],0 [Total(M)],COUNT(*) [ Total(F)],0 [Grand Total] From @Person WHERE gender='F' group by department_id 
union all 
Select department_id,0 as [(Under20)Male],0 [(Under20)Female],0 [Total(M)],0 [ Total(F)],COUNT(*) [Grand Total] From @Person group by department_id 
)A 

INNER JOIN 
@Department D 

ON A.department_id=D.department_id 
GROUP BY D.DepartmentName