sql语句 小记录

select Name '姓名',Age '年龄',
(select LessonName + ',' from Lesson where StudentId=s1.Id FOR XML PATH('')) '课程名称'
from Student s1

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

--------------------创建触发器（插入）
create trigger after_insert_trigger on Student
After insert as
begin
insert into lesson values('政治','7')
end

insert into Student values('孙八','16')
select * from Student
select * from Lesson

---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

----------------------创建触发器(删除)
create trigger after_delete_trigger on Student
after delete as
begin
delete from lesson where studentId=2
end

delete from Student where Id=2
select * from Student
select * from Lesson