SQL查詢外與集團參加由

Question

我有月表MONTHNAME，MonthNumber和整個財年7月份開始，所以我已經分配的值的幾個月就像

MONTHNAME =七月和MonthNumber = 1
MonthName = August和MonthNumber = 2。 MonthName = August和MonthNumber = 2。

我有另一個域表BudgetCategory它有BudgetCategoryId，BudgetCategoryName。

PurchaseOrder表中有OrderID，PurchaseMonth，BudgetCategoryId。

現在我想查詢找出每個BudgetCategory每月購買SUM（TOTALCOST）。如果沒有購買任何BudgetCategoryId我想在報告中顯示零。表

模式：

CREATE TABLE [dbo].[BudgetCategory](
[BudgetCategoryId] [numeric](18, 0) NOT NULL, 
[BudgetCategoryName] [varchar](50) NULL, 
[TotalBudget] [nvarchar](50) NULL) 


CREATE TABLE [dbo].[PurchaseOrder](
[OrderId] [bigint] NOT NULL, 
[BudgetCategoryId] [bigint] NULL, 
[PurchaseMonth] [nvarchar](50) NULL, 
[QTY] [bigint] NULL, 
[CostPerItem] [decimal](10, 2) NULL, 
[TotalCost] [decimal](10, 2) NULL) 


CREATE TABLE [dbo].[MonthTable](
[MonthNumber] [bigint] NULL, 
[MonthName] [nvarchar](30) NULL) 

Answer 1

SELECT b.*, m.MonthNumber, q.[BudgetCategoryId], q.[PurchaseMonth], ISNULL(q.[TotalCost],0) 
FROM [dbo].[BudgetCategory] b 
LEFT JOIN 
    (
     SELECT [BudgetCategoryId], [PurchaseMonth], sum([TotalCost]) [TotalCost] 
     FROM [dbo].[PurchaseOrder] p 
     GROUP BY p.[BudgetCategoryId], [PurchaseMonth] 
    ) q ON b.BudgetCategoryId = q.BudgetCategoryId 
LEFT JOIN [dbo].[MonthTable] m ON q.[PurchaseMonth] = m.[MonthName] 

Answer 2

試試這個：

select a.BudgetCategoryName, 
ISNULL(c.MonthName,'No purchase') as Month, 
sum(ISNULL(TotalCost,0)) as TotalCost 
from #BudgetCategory a left join #PurchaseOrder b on a.BudgetCategoryId = b.BudgetCategoryId 
left join #MonthTable c on b.PurchaseMonth = c.[MonthName] 
group by a.BudgetCategoryName,c.MonthName 
order by a.BudgetCategoryName 

測試與此數據

INSERT #BudgetCategory 
VALUES (1,'CategoryA',1000), 
(2,'CategoryB',2000), 
(3,'CategoryC',1500), 
(4,'CategoryD',2000) 

INSERT #PurchaseOrder (OrderId,BudgetCategoryId,TotalCost,PurchaseMonth) 
VALUES (1,1,550,'July'), 
(2,1,700,'July'), 
(3,2,600,'August') 

INSERT #MonthTable 
VALUES 
(1,'July'), 
(2,'August') 

它會產生這樣的結果：

讓我知道如果這能幫助你