列值转换为逗号分隔字符串

将数据表的某一列值，转换为逗号分隔字符串：

先准备一些数据：

 

declare @t as table([datas] nvarchar(40))
insert into @t ([datas]) values(n'df'),(n'w4f'),(n'eyy'),(n'er'),(n'gff'),(n'a445')

select [datas] from @t order by [datas]

 

一二句sql代码的事：

 

declare @commadelimitedstring nvarchar(max)
select @commadelimitedstring = isnull(@commadelimitedstring + ',', '') + [datas] from @t order by [datas]
select @commadelimitedstring