Question

我有以下两个表（带有数据的SQL脚本）：

CREATE TABLE [dbo].[Item_Master](  
[Item_Name] [varcha`enter code here`r](20) NOT NULL,  
[Item_Cost] [int] NULL,  
 CONSTRAINT [PK_Item_Master] PRIMARY KEY CLUSTERED   
(  
    [Item_Name] ASC  
)  
)  

GO  

CREATE TABLE [dbo].[ItemAnalysis]  
(  
Item_Name nvarchar(20) NOT NULL,  
Analysis_Type nvarchar(20) NOT NULL,  
Item_Quantity int NOT NULL,  
Analysis_Date date NOT NULL  
)  

GO  

insert Item_Master (Item_Name, Item_Cost)   
values ('item1', 2)     
insert Item_Master (Item_Name, Item_Cost)  
values ('item2', 3)  

insert ItemAnalysis (Item_Name, Analysis_Type, Item_Quantity, Analysis_Date)   
values ('item1', 'A', 10, '2012-01-14')  
insert ItemAnalysis (Item_Name, Analysis_Type, Item_Quantity, Analysis_Date)   
values ('item1', 'B', 12, '2012-01-14')  
insert ItemAnalysis (Item_Name, Analysis_Type, Item_Quantity, Analysis_Date)   
values ('item2', 'A', 11, '2012-01-14')  
insert ItemAnalysis (Item_Name, Analysis_Type, Item_Quantity, Analysis_Date)   
values ('item2', 'B', 14, '2012-01-14')  
insert ItemAnalysis (Item_Name, Analysis_Type, Item_Quantity, Analysis_Date)   
values ('item1', 'A', 9, '2012-02-11')  
insert ItemAnalysis (Item_Name, Analysis_Type, Item_Quantity, Analysis_Date)     
values ('item1', 'B', 11, '2012-02-11')  
insert ItemAnalysis (Item_Name, Analysis_Type, Item_Quantity, Analysis_Date)  
values ('item2', 'A', 20, '2012-02-11')  
insert ItemAnalysis (Item_Name, Analysis_Type, Item_Quantity, Analysis_Date)   
values ('item2', 'B', 7, '2012-02-11')

我需要这样的输出：

Item_Name| Item_Cost| Analysis_Date| Type_A_Quantity| Type_B_Quantity  
----------------------------------------------------------------------  
item1|2|2012-01-14|10|12  
item2|3|2012-01-14|11|14  
item1|2|2012-02-11|9|11  
item2|3|2012-02-11|20|7

分析何时完成没有规律性（例如每周或每月等），但每当分析完成时，就会在一天内对所有项目进行分析。

Answer 1

SQL Fiddle

SELECT
    m.Item_Name,
    m.Item_Cost,
    a.Analysis_Date,
    SUM(CASE WHEN Analysis_Type = 'A' THEN Item_Quantity ELSE 0 END) as Type_A_Quantity,
    SUM(CASE WHEN Analysis_Type = 'B' THEN Item_Quantity ELSE 0 END) as Type_B_Quantity
FROM Item_Master m
JOIN ItemAnalysis a
    ON m.Item_Name = a.Item_Name
GROUP BY m.Item_Name, m.Item_Cost, a.Analysis_Date

将行转置和分组到SQL查询中的列中

1 个答案: