USE MadeInChina

DUMP TRANSACTION MadeInChina WITH NO_LOG --清除日志

BACKUP LOG MadeInChina WITH NO_LOG

BACKUP LOG MadeInChina WITH TRUNCATE_ONLY

USE SeekPart_GatherAlibaba

--Test表是机械所有的分类

--筛选机械所有的产品复制表数据到一张新表

SELECT a.ID INTO dbo.ProductID FROM dbo.Product_Info A,Product_Class B WHERE A.CLASSNAME =B.ClassName

--修改产品表将图片表的数据以分号形式隔开

--拼接字符串，主要是用到了STUFF函数，将多行数据用字符串拼接起来，多用于一对多的表之间

UPDATE Product_Info  SET ImgUrls= STUFF((SELECT '|http://img.weiku.com/'+ImageUrl  FROM ProductImage AS b  WHERE ProductId=a1.ID FOR XML PATH('')) , 1 , 1 , '' )

FROM Product_Info a1 

--,ProductImage a2 WHERE a1.ID=a2.ProductId （注释的这部分可以不要）

select top 100, ID , SELECT VV= stuff((select ','+ltrim(ID) from Keywords_ProductsTemp where MemberID=Keywords_MemberInfo.ID for xml path('')),1,1,'') FROM Keywords_MemberInfo

--删除非机械所有数据（适用于百万级、千万级数据删除）

set rowcount 10000

WHILE 1 = 1 

BEGIN  

DELETE TOP(10000) FROM dbo.Product_Info  WHERE ID NOT IN (SELECT ID FROM dbo.ProductID );

IF @@rowcount < 10000 BREAK; 

END

set rowcount 0

父子表查询 一对多的关系

SELECT top 10 a.Id, CodeIds= stuff((select ','+ltrim(AreaCode) from SupplyArea where OrganizationId=a.ID for xml path('')),1,1,'') from Organization a

结果为