我需要對每個行項目的查詢結果進行分析,並構建構成該項目的材料的分號分隔列表。SQL Server 2008 - 連接字符串
架構化妝:
表: 了LineItem(獨特的項目清單) LineItems_Materials(多對多) 材料(獨特的材料清單)
行項目: ID | LineItem的 1 |'1A 0.1'
LineItems_Materials: ID | LineItemID | MaterialID 1 | 1 | 1 2 | 1 | 2 3 | 1 | 3
種材料: ID |材料 1 |混凝土 2 |鋼 3 |越野
所以訂單項1(1A.1)我想讓它顯示混凝土;鋼;骯髒
我知道我可以寫一個函數來做到這一點。我在函數中使用了CTE ....我也可以使用while循環。還有另一種更好的方法嗎?
這裏是我(腳本將構建對象,加載數據,並創建函數):
SCRIPT:
IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[test].[UFN_LineItem_Materials]') AND type in (N'FN', N'IF', N'TF', N'FS', N'FT'))
DROP FUNCTION [test].[UFN_LineItem_Materials]
GO
IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[test].[LineItems]') AND type in (N'U'))
DROP TABLE [test].[LineItems]
GO
IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[test].[Materials]') AND type in (N'U'))
DROP TABLE [test].[Materials]
GO
IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[test].[LineItems_Materials]') AND type in (N'U'))
DROP TABLE [test].[LineItems_Materials]
GO
IF EXISTS (SELECT * FROM sys.schemas WHERE name = N'test')
DROP SCHEMA [test]
GO
CREATE SCHEMA [test] AUTHORIZATION [dbo]
GO
Create Table test.Materials(
MaterialID INT IDENTITY(1,1),
Material varchar(100));
Insert Into test.Materials
Values('Concrete');
Insert Into test.Materials
Values('Steel');
Insert Into test.Materials
Values('Dirt');
GO
Create Table test.LineItems_Materials(
LineItemMaterialID INT IDENTITY(1,1),
LineItemID INT,
MaterialID INT)
GO
Insert Into test.LineItems_Materials
Select 1,1
UNION
Select 1,2
UNION
Select 1,3
GO
CREATE TABLE [test].[LineItems](
[LineItemID] [int] IDENTITY(1,1) NOT NULL,
[ItemNumber] [varchar](25) NULL
) ON [PRIMARY]
GO
Insert Into [test].[LineItems]
Select '1A.1'
GO
-------------------------------------------------------------
--Build Material Strings (;) example: List of Materials
------------------------------------------------------------
CREATE FUNCTION test.UFN_LineItem_Materials(@LineItemID INT)
RETURNS VARCHAR(100)
AS
BEGIN
DECLARE @Materials Varchar(100) = ''
;with CTE
AS(
Select lm.LineItemID,m.MaterialID,m.Material
from test.LineItems_Materials lm
inner join test.Materials m on lm.MaterialID = m.MaterialID
Where lm.LineItemID = @LineItemID
)
Select @Materials += ';' + c.Material
from CTE c;
SET @Materials = substring(@Materials,2,LEN(@Materials)-1);
RETURN @Materials;
END
GO
Select lm.LineItemID,test.UFN_LineItem_Materials(lm.LineItemID) Materials
From test.Materials m
inner join test.LineItems_Materials lm on m.MaterialID = lm.MaterialID
Where m.Material = 'Concrete'
任何其他的想法?如果你想跨行串聯值,可以使用FOR XML伎倆,例如
一直很欣賞的反饋
--S
就是金錢...謝謝! – scarpacci 2010-08-26 21:19:40
這真的很接近我爲 – scarpacci 2010-08-27 01:13:20
+1所做的最簡單的'for xml' – DonBecker 2013-09-17 16:28:42