MS-SQL SERVER单列合并的四种常用方法

/*
原始数据
ID          Name
----------- --------------------
1           吕布
2           张飞
3           赵云
 
结果
-----------------
吕布,张飞,赵云
*/
 
declare @t table(ID int identity,[Name] varchar(6))
insert into @t
select '吕布' union all
select '张飞' union all select '赵云'
 
--方法一
declare @sql varchar(1000);set @sql = ''
select @sql=@sql+[Name]+',' from @t
set @sql=left(@sql,len(@sql)-1)
select @sql as 结果1
 
/*
结果1
----------------
吕布,张飞,赵云
*/
 
--方法二
declare @sqltwo varchar(8000)
select @sqltwo=coalesce(@sqltwo+',','')+[Name] from @t
select @sqltwo as 结果2
/*
结果2
---------------
吕布,张飞,赵云
*/
 
---方法三
declare @sqlthree varchar(8000)
select @sqlthree=isnull(@sqlthree+',','')+[Name] from @t
select @sqlthree as 结果3
/*
结果3
----------------
吕布,张飞,赵云
*/
 
--方法四
select reverse(stuff(reverse((
select [Name]+',' from @t for xml path(''))),1,1,'')) as 结果4
/*
结果4
-----------------
吕布,张飞,赵云
*/