--新建ClassInfo表
create table ClassInfo
(
CID int identity(1,1), --本表ID
CNumber int, --班級人數
CName varchar(10) --班級名稱
);
--給表ClassInfo新增測試數據
insert ClassInfo
select 20,'一年級班'
union select 20,'一年級班'
union select 20,'一年級班'
union select 20,'一年級班';
--新增表Students(CID 班級表外鍵,SID學生信息表ID學生的學號就是,SName)
create table Students
(
[SID] int identity(1,1), --學號
CID int, --班級ID
SName varchar(10) --姓名
);
--給Students新增測試數據
insert into Students
select 1,'張'
union select 1,'張'
union select 1,'張'
union select 1,'張'
union select 2,'張'
union select 2,'張';
按班級顯示人員信息
SELECT a.CID,
STUFF((SELECT ','+SName
FROM Students AS b
WHERE b.CID = a.CID
FOR XML PATH('')),1,1,'') AS SName
FROM Students AS a
GROUP BY a.CID