如何以管道方式生成sql输出

Question

我正在使用。

我有一张这样的学生桌子：

StudentID,Teacher
123,Adams
124,Adams
125,Johnson
126,Johnson
127,Adams
128,Marks

我需要这样的输出：

Teacher,Students
Adams,123|124|127
Johnson,125|126
Marks,128

谢谢你的帮助。谢谢。

Answer 1

declare @table_var table(
    student_id INT,
    teacher varchar(50)
)

insert into @table_var
select 123, 'Adams' union all
select 124, 'Adams' union all
select 125, 'Johnson' union all
select 126, 'Johnson' union all
select 127, 'Adams' union all
select 128, 'Marks'

select * from @table_var

select
    teacher,
    students = stuff((select '|' + convert(varchar, t2.student_id)
                    from @table_var t2 
                    where t1.teacher = t2.teacher 
                    for xml path(''))
                ,1,1,'')
from @table_var t1
group by t1.teacher