數據庫 SQL 15分大作業 2020年

-準備工作

-- 雪梨15分大作業

-- 建庫
create database TeachingManagementSystem
use TeachingManagementSystem


--建表
create table Student     --學生表
(
	Sno char(3) primary key,        --Sno    學號 長度3 主碼
	Sname char(6) not null,			--Sname  姓名 長度6 非空
	Ssex char(2) check(Ssex='男' or Ssex='女'),					
	Sbirthday date not null,		--YYYY-MM-DD
	class char(5) not null			--班級
)
drop table Student


create table Course
(
	Cno char(5) primary key,					--課程號
	Cname varchar(10) not null,					--課程名
	Tno char(3) not null,						--教師編號
	foreign key(Tno) references Teacher(Tno)
)
drop table Course

create table Score
(
	Sno char(3),								--學號
	Cno char(5),								--課程號
	Degree int not null							--成績
	primary key(Sno,Cno),
	foreign key(Sno) references Student(Sno),
	foreign key(Cno) references Course(Cno)
)
drop table Score

create table Teacher 
(
	Tno char(3) primary key,					--教師編號
	Tname char(6) not null,						--教師姓名
	Tsex char(2) check(Tsex='男' or Tsex='女'),	
	Tbirthday date not null,
	Prof char(6) not null,						--職稱
	Depart char(10) not null					--學院
)
drop table Teacher

--更新初始數據

insert into Student(Sno,Sname,Ssex,Sbirthday,class)
values('108','建華','男','1977-09-01','95033');
insert into Student(Sno,Sname,Ssex,Sbirthday,class)
values('105','匡明','男','1975-10-02','95031');
insert into Student(Sno,Sname,Ssex,Sbirthday,class)
values('107','王麗','女','1976-01-23','95033');
insert into Student(Sno,Sname,Ssex,Sbirthday,class)
values('101','李軍','男','1976-02-20','95033');
insert into Student(Sno,Sname,Ssex,Sbirthday,class)
values('109','王芳','女','1975-02-10','95031');
insert into Student(Sno,Sname,Ssex,Sbirthday,class)
values('103','陳君','男','1974-06-03','95031');



insert into Course(Cno,Cname,Tno)
values('3-105','計算機導論','825');
insert into Course(Cno,Cname,Tno)
values('3-245','操作系統','804');
insert into Course(Cno,Cname,Tno)
values('6-166','數字電路','856');
insert into Course(Cno,Cname,Tno)
values('9-888','高等數學','831');


insert into Teacher(Tno,Tname,Tsex,Tbirthday,Prof,Depart)
values('804','李誠','男','1958-12-02','副教授','計算機系')
insert into Teacher(Tno,Tname,Tsex,Tbirthday,Prof,Depart)
values('856','張旭','男','1959-03-12','講師','電子工程系')
insert into Teacher(Tno,Tname,Tsex,Tbirthday,Prof,Depart)
values('825','王萍','女','1972-05-05','助教','計算機系')
insert into Teacher(Tno,Tname,Tsex,Tbirthday,Prof,Depart)
values('831','劉兵','女','1977-08-14','助教','電子工程系')


insert into Score(Sno,Cno,Degree)
values('103','3-245',86);
insert into Score(Sno,Cno,Degree)
values('105','3-245',75);
insert into Score(Sno,Cno,Degree)
values('109','3-245',68);
insert into Score(Sno,Cno,Degree)
values('103','3-105',92);
insert into Score(Sno,Cno,Degree)
values('105','3-105',88);
insert into Score(Sno,Cno,Degree)
values('109','3-105',76);
insert into Score(Sno,Cno,Degree)
values('101','3-105',64);
insert into Score(Sno,Cno,Degree)
values('107','3-105',91);
insert into Score(Sno,Cno,Degree)----
values('108','3-105',78);
insert into Score(Sno,Cno,Degree)
values('101','6-166',85);
insert into Score(Sno,Cno,Degree)
values('107','6-166',79);
insert into Score(Sno,Cno,Degree)---
values('108','6-166',81);

–第一問：

問題一：定義遊標，並實現打印出每門課程的選課人數


--聲明
declare youbiao cursor 
for select Cno from Score
--打開
open youbiao
--操作
declare @num1 int,@num2 int,@num3 int,@num4 int
declare @string1 char(5)
select @num1=0,@num2=0,@num3=0,@num4=0;

fetch next from youbiao into @string1
while @@FETCH_STATUS=0
	begin
		if exists(select * from Course where cno=@string1)
			begin
				if(@string1='3-105')
					set @num1=@num1+1;
				if(@string1='3-245')
					set @num2=@num2+1;
				if(@string1='6-166')
					set @num3=@num3+1;
				if(@string1='9-888')
					set @num4=@num4+1;
			end
				fetch next from youbiao into @string1			
	end
--關閉
close youbiao
--釋放
deallocate youbiao
--打印
select @num1 計算機導論,@num2 操作系統,@num3 數字電路,@num4 高數;

–問題2：

問題二：定義存儲過程，實現傳入班級和課程，得到這個班級這門課程的平均分並打印。（5分）

create proc cunchu
@class char(5), --班級 class
@curse char(5),	--課程 cno
@num float OUT	--平均分
as
begin
	select @num=avg(Degree) from Score  --從已知選擇平均目標
	Where @curse=Cno and Sno in   --確定已知數據來源範圍
	(
		select Sno from Student where class=@class
	)
end




--打印

declare @sss float;
set @sss=0
exec cunchu '95033','3-105',@sss out
select @sss 平均分

–問題3：

問題三：定義函數，實現傳入學生學號，返回學生的選修課程表，包括：學生學號，姓名，課程名，成績，並打印表內容。（5分）

create function hanshu(@sno char(3))
returns table
as
return
(
	select Student.Sno,Sname,Cname,Degree from Student,Score,Course
	where Student.Sno=Score.Sno and 
		Score.Cno=Course.Cno and
		Student.Sno=@sno
)

--打印
select Sno 學號,Sname 姓名,Cname 課程名,Degree 成績 from hanshu('108');

成就感啊，MAX