分岔記錄各自到幾個月

Question

在這裏，我要解釋一下我的情況：

我有如下表：

Table : Service_Type 

Id | Service_Name | Service_Table_Name| 
---------------------------------------- 
1 | FA   | FA  | 
2 | TPA  |  TPA  | 


Table: Service_Mapping 

Id | Service_Type_Id | 
--------------------------- 
1 | 1  | 
2 | 2  | 
3 | 2  | 
4 | 1  | 

Table: FA 

Id | Created_date| Qty | 
----------------------------- 
1 | 3/20/2012 | 20 | 
2 | 4/22/2012 | 10 | 
3 | 5/12/2012 | 15 | 
4 | 6/3/2012 | 5 | 

Table: TPA 

Id | Created_date| Qty | 
----------------------------- 
1 | 5/20/2012 | 2 | 
2 | 7/22/2012 | 10 | 
3 | 1/12/2012 | 1 | 
4 | 9/3/2012 | 5 | 

我想這樣的輸出：

Month | FA| TPA| 
---------------- 
Jan  0 1 
Mar  1 0 
Apr  1 0 
Jul  1 0 
Sep  0 1 

在輸出I要月份到FA和TPA表的Created_date字段。並分別到月份我想總和多少FA和TPA發生在一個月內。

我得到的輸出喜歡

FA | TPA | 
-------------- 
3 | 2 | 

SELECT 
SUM(CASE WHEN Service_Type_Id = 1 THEN 1 ELSE 0 END) AS FA, 
SUM(CASE WHEN Service_Type_Id = 2 THEN 1 ELSE 0 END) AS TPA 
FROM Service_Mapping 

，但現在我想分叉他們各自對他們發生個月。從TPA和FA的日期提交。

Answer 1

試試這個：

SELECT Mon.monthNAME, ISNULL(TPAcount,0) TPAcount, ISNULL(FAcount,0) FAcount FROM 
(
    SELECT DATENAME(MONTH,created_date) AS [monthNAME], MONTH(created_date) [month], YEAR(created_date) as [year] FROM FA 
    UNION 
    SELECT DATENAME(MONTH,created_date) AS [monthNAME], MONTH(created_date) [month], YEAR(created_date) as [year] FROM TPA 
) Mon LEFT JOIN 
(
    SELECT DATENAME(MONTH,created_date) tpaMonth, YEAR(created_date) as [year] , COUNT(1) TPAcount 
    FROM TPA GROUP BY DATENAME(MONTH,created_date), YEAR(created_date) 
) TPA ON TPA.tpaMonth = Mon.monthNAME and tpa.[year] = mon.[year] LEFT JOIN 
(
    SELECT DATENAME(MONTH,created_date) faMonth, YEAR(created_date) as [year] , COUNT(1) FAcount 
    FROM FA GROUP BY DATENAME(MONTH,created_date), YEAR(created_date) 
) FA ON FA.faMonth = MON.monthNAME and FA.[year] = mon.[year] 

ORDER BY 
Mon.[year], Mon.[month] 

Answer 2

您還可以查看另一種方法：

SELECT Mon.monthNAME, SUM(tpCount) tpCount, SUM(faCount) faCount FROM 
(
    SELECT DATENAME(MONTH,created_date) AS [monthNAME], MONTH(created_date) [month], YEAR(created_date) as [year], 0 AS tpCount, 1 as faCount FROM FA 
    UNION 
    SELECT DATENAME(MONTH,created_date) AS [monthNAME], MONTH(created_date) [month], YEAR(created_date) as [year], 1 as tpCount, 0 AS faCount FROM TPA 
) Mon 
GROUP BY 
    [monthNAME],[month],[year] 
ORDER BY 
    Mon.[year], Mon.[month]