for mxl path

create  table tb_class
(
    classId int ,
    className varchar(10)
)
go
insert into tb_class values(1,‘一班‘)
insert into tb_class values(2,‘二班‘)
insert into tb_class values(3,‘三班‘)
go
create table tb_student
(
    classId int,
    stuId varchar(5),
    stuName varchar(10)
)
go
insert into tb_student values(1,‘1001‘,‘张三‘)
insert into tb_student values(1,‘1002‘,‘李四‘)
insert into tb_student values(1,‘1003‘,‘王二‘)
insert into tb_student values(1,‘1004‘,‘麻子‘)
insert into tb_student values(2,‘2001‘,‘王尼玛‘)
insert into tb_student values(2,‘2002‘,‘唐马儒‘)
insert into tb_student values(2,‘2003‘,‘张全蛋‘)
go
select * from tb_class
select * from tb_student

select stuname from tb_student for xml path

<row>
  <stuname>张三</stuname>
</row>
<row>
  <stuname>李四</stuname>
</row>
<row>
  <stuname>王二</stuname>
</row>
<row>
  <stuname>麻子</stuname>
</row>
<row>
  <stuname>王尼玛</stuname>
</row>
<row>
  <stuname>唐马儒</stuname>
</row>
<row>
  <stuname>张全蛋</stuname>
</row>

select stuname from tb_student for xml path(‘‘)

<stuname>张三</stuname>
<stuname>李四</stuname>
<stuname>王二</stuname>
<stuname>麻子</stuname>
<stuname>王尼玛</stuname>
<stuname>唐马儒</stuname>
<stuname>张全蛋</stuname>

select stuname+‘,‘ from tb_student for xml path(‘‘)

select LEFT(stuName, LEN(stuName)-1) from (
select (
select stuname+‘,‘ from tb_student for xml path(‘‘)) as stuName ) a

select ‘可以拼接字符串,‘+LEFT(stuName, LEN(stuName)-1) from (
select (
select stuname+‘,‘ from tb_student for xml path(‘‘)) as stuName ) a