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1.把一个数据库表中的数据插入到另外一个数据库中的一张表中
数据库表结构不同
INSERT INTO [CodeFirstDbContext].[dbo].[Companies](CompanyID,CompanyName,Manager,CompanyType,IsDelete) SELECT CompID,Company,CName,ctype,0 FROM [YFDB2012].[dbo].[Company]
数据库表结构相同
INSERT INTO [CodeFirstDbContext].[dbo].[Companies] SELECT * FROM [YFDB2012].[dbo].[Company]
2.将一个表中的数据串成一个字符串，并分组
SELECT PostId, ( SELECT CAST(PostId AS VARCHAR)+‘,‘+AttachName+‘,‘+ type+‘,‘+ AttachUrl+‘|‘ FROM T_Group_AttachFile WHERE PostId =TGA.PostId FOR XML PATH(‘‘) ) AS AttachFileList FROM T_Group_AttachFile AS TGA GROUP BY PostId
参考资料：http://www.cnblogs.com/doubleliang/archive/2011/07/06/2098775.html
3.查看Sql Server版本
SELECT SERVERPROPERTY(‘productversion‘), SERVERPROPERTY (‘productlevel‘), SERVERPROPERTY (‘edition‘)
4.使用SELECT INTO导出数据
同一数据库
SELECT*INTO table2 FROM table1
不同数据库
USE db1 SELECT*INTO db2.dbo.table2 FROM table1
5.参照一张表修改另外一张表的数据
UPDATE T_Group_AttachFile SET AttachName=T1.AttachName, Type=T1.Type, AttachUrl=T1.AttachUrl FROM (SELECT * FROM dbo.Fn_GetImageTab(@attachStr) WHERE ID!=0) AS T1 INNER JOIN T_Group_AttachFile AS T2 ON T1.ID=T2.FileId
6.利用CTE查询树形结构，从某个根节点到子节点
with cte as ( SELECT GroupId,PGroupId,GroupName,0 as lvl FROM T_Group_Info WHERE GroupId=29 union all select d.GroupId,d.PGroupId,d.GroupName,lvl+1 from cte c inner join T_Group_Info d on c.GroupId = d.PGroupId ) select * from cte
7.定义表变量
DECLARE @temp TABLE(
Id INT,
Col1 NVARCHAR(20)
);
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原文地址：http://www.cnblogs.com/jt789/p/5540826.html
