实验1 数据库的定义和维护

 create table 图书 (
	书号 int primary key,
	类型 nchar(10),
	出版社 nchar(10),
	作者 nchar(5),
	书名 nchar(5),
	定价 smallint
)

create table 读者 (
	读者编号 int primary key,
	姓名 nchar(10),
	单位 nchar(10),
	性别 nchar(1),
	电话 nchar(20),
	constraint r1 check(性别 in ('男','女')), --check约束
)


create table 借阅 (
	书号 int, 
	读者编号 int,
	借书日期 date,
	还书日期 date,
	constraint r2 primary key (书号, 读者编号),
	constraint r3 foreign key (书号) references 图书(书号),
	constraint r4 foreign key (读者编号) references 读者(读者编号)
	-- 外键与被参照关系的主键相同
)



create table student  (
	sno char(10) primary key not null, --学号
	sname char(8), --姓名
	ssex char(2) not null default '男', --性别
	sage smallint , --年龄
	sdept char(30), --所在院系
	stel char(13), --联系电话

	constraint s2 check(sname is not null),
	constraint s1 check(sage >= 18) --check约束
)

--创建索引
create index 学生姓名 on student(sname asc);

--删除约束
alter table student drop constraint s2;



create table Course (
	cno char(10) primary key not null, --课程编号
	cname char(16) not null, --课程名称
	ccredit smallint not null, --学分
	cpno char(10) --先行课
)

-- 创建索引  cno (升序)+ccredit(降序)
create index 课程编号 on Course(cno asc);
create index 学分 on Course(ccredit desc);


--增加属性列教师 ctech(类型是 char)
alter table Course add ctech char(10);


create table SC (
	sno char(10) not null, --学号
	cno char(10) not null, --课程编号
	grade smallint, --成绩

	constraint sc1 primary key(sno,cno),  --主键约束
	--建立外键约束
	constraint sc2 foreign key(sno) references student(sno), 
	constraint sc3 foreign key(cno) references Course(cno)
)


建表分割线，下面是操作
---------------------------------------------------------------
任务1：


insert into 读者 values('2110', '张零', '数计', '男', '123450');
insert into 读者 values('2111', '张一', '数计', '女', '123451');
insert into 读者 values('2112', '张二', '数计', '男', '123452');
insert into 读者 values('2113', '张三', '数计', '女', '123453');
insert into 读者 values('2114', '张四', '数计', '男', '123454');
insert into 读者 values('2115', '张五', '数计', '女', '123455');
insert into 读者 values('2116', '张六', '数计', '男', '123456');
insert into 读者 values('2117', '张七', '管理', '女', '123457');
insert into 读者 values('2118', '张八', '数计', '男', '123458');
insert into 读者 values('2119', '张九', '数计', '女', '123459');



insert into 图书 values('12345', '搞笑','虾皮','张哥',
'中国有哈哈', '30');
insert into 图书 values('12344', '计算机','机械工业','布莱恩特',
'csapp', '110');
insert into 图书 values('12343', '计算机','电子工业','王道',
'操作系统', '32');
insert into 图书 values('12342', '计算机','电子工业','王道',
'计网', '80');
insert into 图书 values('12341', '计算机','电子工业','王道',
'数据结构', '90');
insert into 图书 values('12340', '计算机','电子工业','王道',
'机组', '110');
insert into 图书 values('12348', '计算机','电子工业','张哥',
'中国哈哈1', '220');
insert into 图书 values('12349', '计算机','虾皮出版社','张哥',
'中国哈哈2', '30');
insert into 图书 values('12347', '计算机','虾皮出版社','张哥',
'中国哈哈3', '30');
insert into 图书 values('12350', '计算机','虾皮出版社','张哥',
'中国哈哈4', '30');



insert into 借阅 values('12345', '2110', '2023-1-9', '2023-3-23');
insert into 借阅 values('12344', '2112', '2023-1-10', '2023-2-23');
insert into 借阅 values('12344', '2113', '2023-1-11', '2023-1-23');
insert into 借阅 values('12345', '2113', '2023-1-12', '2023-1-21');
insert into 借阅 values('12340', '2111', '2023-1-14', '2023-3-9');
insert into 借阅 values('12342', '2119', '2023-1-17', '2023-3-1');
insert into 借阅 values('12341', '2110', '2023-1-27', '2023-3-4');
insert into 借阅 values('12343', '2110', '2023-1-3', '2023-3-8');
insert into 借阅 values('12344', '2111', '2023-1-5', '2023-2-21');
insert into 借阅 values('12342', '2110', '2023-1-7', '2023-2-17');



--修改某位读者的还书日期
update 借阅 set 还书日期 = '2023-4-19' where 读者编号 = '2111';

--删除某位读者的换数记录记录
delete from 借阅 where 读者编号 = '2111';


任务2：

insert into student 
values('20021210', '张零', '男','20','数计', '123450');
insert into student 
values('20021211', '张一', '女','20','数计', '123451');
insert into student 
values('20021212', '张二', '男','20','管理', '123452');
insert into student 
values('20021213', '张三', '女','20','数计', '123453');
insert into student 
values('20021214', '张四', '男','20','数计', '123454');
insert into student 
values('20021215', '张五', '女','20','数计', '123455');
insert into student 
values('20021216', '张六', '男','20','数计', '123456');
insert into student 
values('20021217', '张七', '女','20','管理', '123457');
insert into student 
values('20021218', '张八', '男','20','数计', '123458');
insert into student 
values('20021219', '张九', '女','20','数计', '123459');



insert into Course values ('1', '高数', '5', null, null);
insert into Course values ('2', '线代', '4', null, null);
insert into Course values ('3', '概率论', '5', null, null);
insert into Course values ('4', 'C语言', '5', null, null);
insert into Course values ('5', 'C++', '5', null, null);
insert into Course values ('6', '编译原理', '5', null, null);
insert into Course values ('7', '数据库', '3', '离散数学', null);
insert into Course values ('8', '离散数学', '5', null, null);
insert into Course values ('9', '操作系统', '5', null, null);
insert into Course values ('10', '计网', '5', null, null);



insert into SC 
values ('20021210', '1', 80);
insert into SC 
values ('20021211', '2', 70);
insert into SC 
values ('20021212', '3', 75);
insert into SC 
values ('20021213', '4', 55);
insert into SC 
values ('20021214', '5', 98);
insert into SC 
values ('20021215', '6', 100);
insert into SC 
values ('20021216', '7', 60);
insert into SC 
values ('20021217', '8', 77);
insert into SC 
values ('20021218', '9', 54);
insert into SC 
values ('20021219', '10', 59);



use XSXK;

--1
create table Grade (
	son char(10),
	cnt char(10),
	avggrade char(10)
)

insert into Grade
select sno, count(*) as cnt, avg(grade) as avggrade
from SC  group by sno



--2
--update Course set ccredit = 4 where cname = '数据库';


--3

update SC set grade = grade + 5
where sno = (select sno from student where sname = '张六') and cno = (select cno f);


--4
--delete from SC where grade < 60;

--5 必须要SC在上面
--delete from SC where sno = '20021211';
--delete from student where sno = '20021211';


--6
--delete from SC 
--where cno = (select cno from Course where cname = 'C++');

--7
--update SC set grade = null 
--where sno in (select sno from student where sdept = '数计');

--8 删除张七的所有选课记录
--delete from SC where sno = (select sno from student where sname = '张七')

实验2 数据库的简单查询和连接查询

--新数据
insert into student
values ('2001124001', '张飞', '男',  23, '管理学院','1464312');
insert into student
values ('2001124002', '郭旭', '男',  89,'管理学院', '1145114');
insert into student
values ('2001124004', '周波', '男',  23, '数计学院','4654654');
insert into student
values ('2001124005', '张柏芝', '女',  30, '数计学院','154666');
insert into student
values ('2001124006', '风清扬', '男',  28, '管理学院','14645463');
insert into student
values ('2001124007', '唐伯虎', '男',  26, '材料学院','1454643');
insert into student
values ('2001124008', '于占鳌', '男',  25, '电气学院','7842289');
insert into student
values ('2001124009', '九儿', '女',  19, '电气学院','774512');
insert into student
values ('2001124010', '李茂贞', '女',  29, '电气学院','6659873');
insert into student
values ('2001124011', '紫霞', '女',  19, '材料学院','4654562');


INSERT INTO Course
VALUES ('001', 'java', '4', '003', NULL)
     , ('002', 'c语言', '4', '003', NULL)
     , ('003', '数据结构', '4', NULL, NULL)
     , ('004', '数据库原理', '3', '002', NULL)
     , ('005', '计算机组成原理', '2', NULL, NULL)
     , ('006', '操作系统', '2', '005', NULL)
     , ('007', '计算机网络原理', '3', NULL,NULL)
     , ('008', '高等数学', '5', NULL, NULL)
     , ('009', '大学英语一', '2', NULL, NULL)
     , ('010', '大学物理三', '3', NULL, NULL)
;

insert into SC (sno, grade, cno)
values
	   ('2001124001', null, '001'),
       ('2001124001', 82, '002'),
       ('2001124001', 78, '003'),
       ('2001124001', 96, '004'),
       ('2001124001', 76, '005'),
       ('2001124001', 39, '006'),
       ('2001124001', 88, '007'),
       ('2001124001', null, '008'),
       ('2001124001', 82, '009'),
       ('2001124001', 69, '010');

insert into SC (sno, grade, cno)
values ('2001124002', 98, '001'),
       ('2001124002', 92, '002'),
       ('2001124002', 78, '003'),
       ('2001124002', 96, '004'),
       ('2001124002', null, '005'),
       ('2001124002', 88, '006'),
       ('2001124002', 88, '007'),
       ('2001124002', 81, '008'),
       ('2001124002', 82, '009'),
       ('2001124002', 79, '010');


insert into SC (sno, grade, cno)
values ('2001124005', 66, '001'),
       ('2001124005', 72, '002'),
       ('2001124005', 88, '003'),
       ('2001124005', 76, '004'),
       ('2001124005', 76, '005'),
       ('2001124005', 68, '006'),
       ('2001124005', 68, '007'),
       ('2001124005', 86, '008'),
       ('2001124005', 80, '009'),
       ('2001124005', null, '010');


insert into SC (sno, grade, cno)
values ('2001124004', 46, '001'),
       ('2001124004', null, '002'),
       ('2001124004', null, '003'),
       ('2001124004', 87, '004'),
       ('2001124004', null, '005'),
       ('2001124004', 58, '006'),
       ('2001124004', 68, '007'),
       ('2001124004', 61, '008'),
       ('2001124004', 72, '009'),
       ('2001124004', 59, '010');

insert into SC (sno, grade, cno)
values ('2001124006', 49, '001'),
       ('2001124006', 52, '002'),
       ('2001124006', 88, '003'),
       ('2001124006', 87, '004'),
       ('2001124006', 66, '005'),
       ('2001124006', 88, '006'),
       ('2001124006', 68, '007'),
       ('2001124006', 61, '008'),
       ('2001124006', 72, '009'),
       ('2001124006', null, '010');



insert into SC (sno, grade, cno)
values ('2001124007', 86, '001'),
       ('2001124007', 42, '002'),
       ('2001124007', 69, '003'),
       ('2001124007', 87, '004'),
       ('2001124007', 65, '005'),
       ('2001124007', null, '006'),
       ('2001124007', 58, '007'),
       ('2001124007', 61, '008'),
       ('2001124007', 72, '009'),
       ('2001124007', 69, '010');


insert into SC (sno, grade, cno)
values ('2001124008', 87, '001'),
       ('2001124008', 72, '002'),
       ('2001124008', 68, '003'),
       ('2001124008', 87, '004'),
       ('2001124008', 96, '005'),
       ('2001124008', 58, '006'),
       ('2001124008', 68, '007'),
       ('2001124008', 61, '008'),
       ('2001124008', 72, '009'),
       ('2001124008', 59, '010');

insert into SC (sno, grade, cno)
values ('2001124009', 86, '001'),
       ('2001124009', 92, '002'),
       ('2001124009', 68, '003'),
       ('2001124009', 87, '004'),
       ('2001124009', 66, '005'),
       ('2001124009', 58, '006'),
       ('2001124009', 68, '007'),
       ('2001124009', 61, '008'),
       ('2001124009', 72, '009'),
       ('2001124009', 79, '010');


insert into SC (sno, grade, cno)
values ('2001124010', 96, '001'),
       ('2001124010', null, '002'),
       ('2001124010', 88, '003'),
       ('2001124010', 87, '004'),
       ('2001124010', 86, '005'),
       ('2001124010', null, '006'),
       ('2001124010', null, '007'),
       ('2001124010', 79, '008'),
       ('2001124010', 72, '009'),
       ('2001124010', null, '010');



insert into SC (sno, grade, cno)
values ('2001124011', 86, '001'),
       ('2001124011', 82, '002'),
       ('2001124011', 58, '003'),
       ('2001124011', 87, '004'),
       ('2001124011', 66, '005'),
       ('2001124011', 98, '006'),
       ('2001124011', 78, '007'),
       ('2001124011', 81, '008'),
       ('2001124011', null, '009'),
       ('2001124011', 79, '010');

use XSXK;

-- 简单查询


--1
select sno as 学号, sname as 姓名
from student 
where sdept = '数计学院';

--2
select sno 
from student
where (select count(cno) 
	from SC
	where SC.sno = student.sno
) > 0;
 
--3
select sno as 学生学号, grade as 成绩 
from SC 
where cno = '005'
order by grade desc, sno asc;

--4 
select sno as 学生学号, grade * 0.8 as 成绩
from SC
where cno = '005' and grade >= 80 and grade <= 90;

--5 
select * 
from student
where sdept in('管理学院', '数计学院') and sname like '张%';

--6
select sno as 学号, cno as 课程号
from SC
where grade is null;


-- 连接查询

--1 
select  SC.sno      as  学号,
		student.sname as 姓名,
		Course.cname  as 选修的课程,
		SC.grade      as 成绩
from SC
          join student on SC.sno = student.sno
          join course on SC.cno = Course.cno

--2
select Course.*
from  SC 
			join student on SC.sno = student.sno 
			join Course on SC.cno = Course.cno
where Course.ccredit > 2 and student.sdept = '数计学院'


--3 
select 
		student.*, 
		Course.cno as 选课编号,
		SC.grade as 成绩
from SC	
		join student on SC.sno = student.sno
		join Course on SC.cno = Course.cno


select student.*   

select
		student.* ,
		Course.cno as 选课编号,
		SC.grade as 成绩
from   student
		join SC on SC.sno = student.sno
		join Course on SC.cno = Course.cno;


--4
select 
	SC.sno as 学号,
	student.sname as 姓名,
	SC.grade as 成绩
from SC
	join student on student.sno = SC.sno
	join Course on Course.cno = SC.cno
where 
	SC.cno = '002' and SC.grade >= 90


--5
select a.cname as 课程, c.cname as 先行课
from Course a, Course b, Course c
where a.cpno = b.cno and b.cpno = c.cno


--6
select sno from sc group by sno having count(* )>= 2

select distinct s.sno as 学号
from student s
join SC sc1 on sc1.sno = s.sno
join SC sc2 on sc2.sno = s.sno and sc2.cno != sc1.cno

select distinct sc1.sno as 学号
from SC sc1
join SC sc2 on sc2.sno = sc1.sno and sc2.cno != sc1.cno

实验3 数据库的组合查询和嵌套查询

--嵌套查询

--1
select sno as 学生学号, sname as 姓名
from student
where sno in (select sno from SC 
		where cno = ( select cno  from Course  where cname = '数据结构')
)

--2
select sno as 学生学号, sname as 学生姓名
from student
where sage > (select sage from student  where sname = '张飞')

--3
select distinct student.sno as 学生学号, SC.grade as 成绩
from student, SC
where grade < (select grade from SC where sno = 
		(select sno from student where sname = '张飞' ) and cno = (select cno from Course where cname = '数据结构'))
		
--4
select student.*
from  student
where sage < (select min(sage) from student where sdept = '数计学院')

--5
select student.sname as 学生姓名
from student
where sno in (select sno from SC where cno = 
		  (select cno from Course where cname = '数据结构'));

--6
select sname
from student
where not exists (
	select *
	from course 
	where not exists (
	select *
	from sc
	where sc.sno = student.sno and sc.cno = course.cno
	)
);
		  

--7
select sname as 学生姓名, sno as 学生学号
from student 
where sno in (select sno from SC where cno in (
	select cno from SC where sno = '2001124001'
))

--8
select sno as 学号, sname as 学生姓名
from student
where not exists (
	select * 
	from course 
	where not exists (
	select *
	from sc 
	where sc.sno = '2001124001' and sc.cno =  course.cno
	)
)


--9
select sname as 学生姓名
from student 
where sno in (
	select sno 
	from sc
	where cno = (
		select cno
		from course
		where cname = '数据结构'
	)
	and sno in (
	select sno 
	from sc
	where cno = (
		select cno
		from course
		where cname = '数据库原理'
	)
	)
)

--10
select sname as 学生姓名
from student 
where sno in (
	select sno 
	from sc
	where cno = (
		select cno
		from course
		where cname = '数据结构'
	)
	or sno in (
	select sno 
	from sc
	where cno = (
		select cno
		from course
		where cname = '数据库原理'
	)
	)
)

--11
select sname as 学生姓名
from student 
where sno in (
	select sno 
	from sc
	where cno = (
		select cno
		from course
		where cname = '数据结构'
	)
	and sno in (
	select sno 
	from sc
	where cno in (
		select cno
		from course
		where cname != '数据库原理'
	)
	)
)

--12 
select cno as 课程号
from sc x
where not exists (
	select *
	from student 
	where ssex = '女' and exists (
		select *
		from sc y
		where x.cno = y.cno and x.sno = y.sno 
	)
)



--组合查询和统计查询
--1
select sname 
from student
where sno in (
	select sno 
	from sc
	where cno = (
	select cno
	from course
	where cname = '数据结构'
	)
)
intersect  
select sname 
from student
where sno in (
	select sno 
	from sc
	where cno = (
	select cno
	from course
	where cname = '数据库原理'
	)
)


--2
select sname 
from student
where sno in (
	select sno 
	from sc
	where cno = (
	select cno
	from course
	where cname = '数据结构'
	)
)
union 
select sname 
from student
where sno in (
	select sno 
	from sc
	where cno = (
	select cno
	from course
	where cname = '数据库原理'
	)
)


--3
select sname 
from student
where sno in (
	select sno 
	from sc
	where cno = (
	select cno
	from course
	where cname = '数据结构'
	)
)
except 
select sname 
from student
where sno in (
	select sno 
	from sc
	where cno = (
	select cno
	from course
	where cname = '数据库原理'
	)
)

--4
select count(distinct sc.sno) as 学生人数
from sc



--5
select sno as 学生学号, sum(grade) as 总成绩
from sc
where grade >= 60 group by sno having count(*) > 4


--6
select sdept as 学院, count(*) as 学院人数
from student
group by sdept

--7
select sage as 年龄, count(*) as 人数
from student
group by sage

--8
select count(cno) as 选课数, avg(grade) 平均成绩
from sc
group by sno

--9
select	course.*, cc.选课人数 from course  left join 
		(select 
		  Course.cno,
		  COUNT (sno) '选课人数'
		from
		  course
		  left join sc
			on course.cno = sc.cno
		group by course.cno) as cc on course.cno = cc.cnos

第四章课前实验

use 图书管理;

create table 读者 (
	读者卡号 char(50) primary key,
	姓名 char(50),
	性别 char(50), 
	单位 char(50),
	办卡日期  date,
	卡状态 char(50),
	类别编号 int
)

create table 出版社 (
	出版社名称 char(50) primary key,
	地址 char(50) 
)

create table 图书 (
	图书编号 char(50) primary key,
	书名 char(50),
	类别 char(50),
	作者 char(50),
	出版社名称 char(50),
	出版日期 date,
	单价 float,
	库存数量 int
)


create table 借阅 (
	读者卡号 char(50),
	图书编号 char(50) primary key(读者卡号, 图书编号),
	借书日期 date,
	还书日期 date
)


insert into 读者 values
('2100001','李丽','女','数计学院','2021-03-10','正常','01'),
('2100002','赵健','男','数计学院','2021-03-10','正常','01'),
('2100003','张飞','男','数计学院','2020-09-10','正常','02'),
('2100004','赵亮','男','数计学院','2021-03-10','正常','03'),
('2100005','张晓','女','管理学院','2021-09-10','正常','03'),
('2200001','杨少华','男','管理学院','2021-09-10','正常','04'),
('2200002','王武','男','数计学院','2021-09-10','正常','02')



insert into 出版社 values
('电子工业出版社','北京'),
('高等教育出版社','北京'),
('机械工业出版社','北京'),
('科学出版社','北京'),
('南海出版社','海口'),
('清华大学出版社','北京'),
('人民邮电出版社','北京'),
('西南财经大学','成都')



insert into 图书 values
('GL0001','APP营销实战','管理','谭贤','人民邮电出版社','2021-03-01',58.0000,5),
('GL0002','产品经理的自我修炼','管理','张晨静','人民邮电出版社','2021-03-01',52.0000,5),
('GL0003','管理学原理','管理','赵玉田','科学出版社','2021-01-01',38.0000,5),
('JSJ001','Python数据挖掘与机','计算机','魏伟一','清华大学出版社',' 2021-03-01',59.0000,5),
('JSJ002','机器学习','计算机','赵卫东','人民邮电出版社','2020-09-01',58.0000,5),
('JSJ003','数据库应用与开发教程','管理','谭贤','人民邮电出版社','2021-03-01',58.0000,5)


insert into 借阅 values
('2100001','GL0003','2021-04-10','2021-07-10'),
('2100002','JSJ001','2021-04-10',''),
('2100002','JSJ003','2021-04-10',''),
('2100004','GL0003','2021-05-10','2021-07-10'),
('2100004','JSJ001','2021-05-10','2021-07-10'),
('2100001','JSJ005','2021-05-10','2021-07-10')



--1
insert into 出版社 values
('西安电子科技大学出版社', '西安');


--2 
insert into 读者 values
('2200003', '陈晨','男', '机械学院', '2021-10-10', '正常', '02');


--3
insert into 图书 values
('SK0001','请不要辜负这个时代','社科','周小平',
'南海出版社','2020-11-01','32.00','5');

--4 
delete from 读者 where 姓名 = '杨少华';









use 图书管理1;

create table 图书管理 (
	读者卡号 char(50),
	图书编号 char(50), primary key(读者卡号, 图书编号),
	姓名 char(50),
	性别 char(50),
	单位 char(50),
	书名 char(50),
	类别 char(50),
	作者 char(50),
	出版社名称 char(50), 
	地址 char(50),
	出版日期 date,
	单价 float,
	库存数量 int,
	借书日期 date,
	还书日期 date
)

insert into 图书管理 values
('2100001','GL0001','张一年','男','数计学院','数据库','计算机','王佳和','人民邮电出版社','陕西','2021-04-10',38.00000,5,'2021-05-10','2021-07-10'),
('2100002','GL0002','张二月','男','数计学院','数据库','计算机','王佳和','人民邮电出版社','陕西','2021-04-10',38.00000,5,'2021-05-10','2021-07-10'),
('2100003','GL0003','张三天','男','数计学院','数据库','计算机','王佳和','人民邮电出版社','陕西','2021-04-10',38.00000,5,'2021-05-10','2021-07-10'),
('2100004','GL0004','张四日','男','数计学院','数据库','计算机','王佳和','人民邮电出版社','陕西','2021-04-10',38.00000,5,'2021-05-10','2021-07-10'),
('2100005','GL0005','张五秒','男','数计学院','数据库','计算机','王佳和','人民邮电出版社','陕西','2021-04-10',38.00000,5,'2021-05-10','2021-07-10'),
('2100006','GL0006','张六六','男','数计学院','数据库','计算机','王佳和','人民邮电出版社','陕西','2021-04-10',38.00000,5,'2021-05-10','2021-07-10'),
('2100007','GL0007','杨少华','男','数计学院','数据库','计算机','王佳和','人民邮电出版社','陕西','2021-04-10',38.00000,5,'2021-05-10','2021-07-10')


--1 
insert into 图书管理 (出版社名称, 地址) values
('西安电子科技大学出版社', '西安');

--2  无法插入
insert into 图书管理 values
('2200003','陈晨','男','机械学院','2021-10-10','正常','02');


--3 无法插入
insert into 图书管理(图书编号,书名,类别,作者,
出版社名称,出版日期,单价,库存数量) values
('SK0001','请不要辜负这个时代','社科',
'周小平','南海出版社','2020-11-01',32.00,5);


--4 
delete from 图书管理 where 姓名 = '杨少华';

实验5

--创建数据库
create database 学生成绩管理系统

--创建教学系表
create table tdept(
       tdept_no varchar(10) primary key,--编号，主键约束
	   tdept_name varchar(10) not null--名称
)

--创建专业表
create table subject(
       subject_no varchar(10) primary key,--编号，主键约束
	   subject_name varchar(15) not null,--名称
	   tdept_no varchar(10)
	   constraint FK_subject_tdept foreign key (tdept_no) references tdept(tdept_no)
)

--创建班级表
create table class(
       class_no varchar(10) primary key,--编号，主键约束
	   class_name varchar(15) not null,--名称
	   subject_no varchar(10)
	   constraint FK_class_subject foreign key (subject_no) references subject(subject_no)
)

--创建学生表
create table student(
	   sno char(10) not null primary key,--编号，主键约束
	   sname char(8) not null,--姓名
	   ssex char(2) not null,--性别
	   sage smallint,--年龄
	   class_no varchar(10),
	   constraint FK_student_class foreign key(class_no) references class(class_no)
)
--创建课程表
create table course(
	   cno char(10) not null primary key,--编号，主键约束
	   cname char(16) not null,--名称
	   ccredit smallint not null,--学分
	   chours smallint not null,--学时
  	   kind varchar(10),--课程性质
	   semester varchar(20) not null--开课学期
)

--创建开设课程表
create table class_compulsory(
       cno char(10) not null,--编号
	   class_no varchar(10),
	   start_date date not null,--开始日期
	   -- 添加参照完整性约束
	   constraint fk3_cno_class_no primary key(class_no,cno),
       constraint fk3_class_compulsory foreign key(class_no) references class(class_no),
	   constraint fk3_compulsory_class foreign key(cno) references course(cno)
)

--创建必修课表
create table compulsory(
	   cno char(10) not null primary key
	   constraint FK_compulsory_course foreign key(cno) references course(cno)
)

--创建选修课表
create table Selective(
	   cno char(10) not null primary key,--编号，主键约束
	   start_time date not null,--开始时间
	   end_time date not null,--结束时间
	   constraint FK_Selective_course foreign key(cno) references course(cno)
)



--创建选修表
create table student_Selective(
	sno char(10) not null,
	cno char(10) not null,
	grade smallint,--成绩
	point smallint,--绩点
	--添加参照完整性约束
	constraint fk1_c1_c2 primary key(sno,cno),
	constraint fk1_student foreign key(sno) references student(sno),
	constraint fk1_Selective foreign key(cno) references course(cno)
)

--创建必修表
create table student_compulsory(
	sno char(10) not null,
	cno char(10) not null,
	grade smallint,--成绩
	point smallint,--绩点
	--添加参照完整性约束
	constraint fk2_c1_c2 primary key(sno,cno),
	constraint fk2_student foreign key(sno) references student(sno),
	constraint fk2_Selective foreign key(cno) references course(cno)
)

--创建触发器

--学生基本信息的删除
--删除学生的基本信息，学生的选修课信息也删除
go								
create trigger student_Selective_delete 
 on student 
 for delete
as if (select count(*)
		from student_Selective,deleted
		where student_Selective.sno = deleted.sno)>0
begin
	delete student_Selective
		from student_Selective inner join deleted
					on student_Selective.sno = deleted.sno
end

--删除学生的基本信息，学生的必修课信息也删除
go
create trigger student_compulsory_delete 
 on student 
 for delete
as if (select count(*)
		from student_compulsory,deleted
		where student_compulsory.sno = deleted.sno)>0
begin
	delete student_compulsory
		from student_compulsory inner join deleted
					on student_compulsory.sno = deleted.sno
end

--删除课程的基本信息，所有选修该课程的信息也全部删除
go
create trigger course_delete
on course
for delete
as if (select count(*)
		from Selective,deleted
		where Selective.cno = deleted.cno)>0
begin 
	delete Selective
		from Selective inner join deleted
			on Selective.cno = deleted.cno
	delete student_Selective
		from student_Selective inner join deleted
			on student_Selective.cno = deleted.cno
end

--删除课程的基本信息，所有必修该课程的信息也全部删除
go
create trigger course_delete1
on course
for delete
as if (select count(*)
		from compulsory,deleted
		where compulsory.cno = deleted.cno)>0
begin 
	delete compulsory
		from compulsory inner join deleted
			on compulsory.cno = deleted.cno
	delete student_compulsory
		from student_compulsory inner join deleted
			on student_compulsory.cno = deleted.cno
end

--4.2确定索引
create unique index index1 on student (sno)
create index index2 on class_compulsory (start_date)
create index index3 on student_Selective (cno)
create index index4 on student_compulsory (cno)

--6建立视图
go
create view 学生成绩
as
select s.sno,sname,class_name,c.cname,sc.grade,sc.point
	from student s,class,course c,student_compulsory sc
		where s.class_no = class.class_no
				and s.sno = sc.sno 
				and sc.cno = c.cno
union
select s.sno,sname,class_name,c.cname,ss.grade,ss.point
	from student s,class,course c,student_Selective ss
		where s.class_no = class.class_no
				and s.sno = ss.sno 
				and ss.cno = c.cno
go

--7.录入数据
--教学系表
insert into tdept (tdept_no,tdept_name)
            values('T001','数计学院'),
			      ('T002','管理学院'),
				  ('T003','外语学院'),
				  ('T004','生工学院'),
				  ('T005','化工学院')

--专业表
insert into subject (subject_no,subject_name,tdept_no)
            values('S001','计算机科学技术','T001'),
			      ('S002','网络工程','T001'),
				  ('S003','酒店管理','T002'),
				  ('S004','工程管理','T002'),
				  ('S005','英语','T003'),
				  ('S006','日语','T003'),
				  ('S007','生物科学','T004'),
				  ('S008','食品工程','T004'),
				  ('S009','化学科学','T005'),
				  ('S010','应用化学','T005')

--班级表
insert into class(class_no,class_name,subject_no)
            values('C001','计科01','S001'),
			      ('C002','计科02','S001'),
				  ('C003','网工01','S002'),
				  ('C004','网工02','S002'),
				  ('C005','酒管01','S003'),
				  ('C006','酒管02','S003'),
				  ('C007','工管01','S004'),
				  ('C008','工管02','S004'),
				  ('C009','英语01','S005'),
				  ('C010','英语02','S005'),
				  ('C011','日语01','S006'),
				  ('C012','日语02','S006'),
				  ('C013','生科01','S007'),
				  ('C014','生科02','S007'),
				  ('C015','食品01','S008'),
				  ('C016','食品02','S008'),
				  ('C017','化学01','S009'),
				  ('C018','化学02','S009'),
				  ('C019','应化01','S010'),
				  ('C020','应化01','S010')

--学生表
insert into student (sno,sname,ssex,sage,class_no)
            values('200001','张三','男',19,'C001'),
			      ('200002','李四','男',21,'C002'),
				  ('200003','王五','男',20,'C003'),
				  ('200004','赵六','男',18,'C004'),
				  ('200005','张一','女',22,'C005'),
				  ('200006','张二','女',19,'C006'),
				  ('200007','张四','男',18,'C007'),
				  ('200008','张五','男',20,'C008'),
				  ('200009','张六','男',21,'C009'),
				  ('200010','张七','男',18,'C010'),
				  ('200011','张八','男',18,'C011'),
				  ('200012','张九','女',19,'C012'),
				  ('200013','张十','男',20,'C013'),
				  ('200014','张十一','男',18,'C014'),
				  ('200015','张十二','女',21,'C015'),
				  ('200016','张十三','男',20,'C016'),
				  ('200017','张十四','男',17,'C017'),
				  ('200018','张四五','女',18,'C018'),
				  ('200019','张二三','女',18,'C019'),
				  ('200020','杰哥','男',19,'C020')

--课程表
insert into Course(cno,cname,ccredit,chours,kind,semester)
            values('cn001','高等数学一',5,48,'公共必修课','第一学期'),
			      ('cn002','高等数学二',5.5,48,'公共必修课','第二学期'),
				  ('cn003','大学物理一',3,48,'公共必修课','第二学期'),
				  ('cn004','大学物理二',3.5,48,'公共必修课','第三学期'),
				  ('cn005','大学英语一',2.5,48,'公共必修课','第一学期'),
				  ('cn006','大学英语二',2,48,'公共必修课','第二学期'),
				  ('cn007','语言的魅力',2,32,'公共选修课','第一学期'),
				  ('cn008','生物之谜',2,32,'公共选修课','第二学期'),
				  ('cn009','电影鉴赏',2,32,'公共选修课','第三学期'),
				  ('cn010','基因与人',2,32,'公共选修课','第四学期'),
				  ('cn011','数学建模',2,32,'公共选修课','第五学期'),
				  ('cn012','生物之谜',2,32,'公共选修课','第六学期'),
				  ('cn013','JAVA',3,40,'专业必修课','第三学期'),
				  ('cn014','管理概要',3,40,'专业必修课','第二学期'),
				  ('cn015','翻译概要',3,40,'专业必修课','第三学期'),
				  ('cn016','生理基础',3,40,'专业必修课','第四学期'),
				  ('cn017','工艺流程',3,40,'专业必修课','第五学期'),
				  ('cn018','数据库原理',3,40,'专业必修课','第四学期'),
				  ('cn019','JAVAEE',4,24,'专业选修课','第五学期'),
				  ('cn020','管理信息学',4,24,'专业选修课','第六学期'),
				  ('cn021','商务英语',4,24,'专业选修课','第五学期'),
				  ('cn022','生物化学',4,24,'专业选修课','第六学期'),
				  ('cn023','无机化学',4,24,'专业选修课','第五学期'),
				  ('cn024','Python',4,24,'专业选修课','第六学期')

--必修课表
insert into compulsory(cno)
            values('cn001'),
			      ('cn002'),
				  ('cn003'),
				  ('cn004'),
				  ('cn005'),
				  ('cn006'),
				  ('cn013'),
				  ('cn014'),
				  ('cn015'),
				  ('cn016'),
				  ('cn017'),
				  ('cn018')

--选修课表
insert into Selective(cno,start_time,end_time)
            values('cn007','2020-09-01','2021-02-01'),
			      ('cn008','2020-09-01','2021-02-01'),
				  ('cn009','2020-09-01','2021-02-01'),
				  ('cn010','2020-09-01','2021-02-01'),
				  ('cn011','2020-09-01','2021-02-01'),
				  ('cn012','2020-09-01','2021-02-01'),
				  ('cn019','2020-11-01','2021-01-01'),
				  ('cn020','2020-11-01','2021-01-01'),
				  ('cn021','2020-11-01','2021-01-01'),
				  ('cn022','2020-11-01','2021-01-01'),
				  ('cn023','2020-11-01','2021-01-01'),
				  ('cn024','2020-11-01','2021-01-01')

--必修表
insert into student_compulsory(sno,cno,grade,point)
            values('200001','cn001',85,3.5),
			      ('200002','cn001',72,2),
				  ('200003','cn001',66,1.5),
				  ('200004','cn001',91,4),
				  ('200005','cn001',82,3),
				  ('200006','cn001',60,1),
				  ('200001','cn002',85,3.5),
			      ('200002','cn002',72,2),
				  ('200003','cn002',66,1.5),
				  ('200004','cn002',91,4),
				  ('200005','cn002',82,3),
				  ('200006','cn002',60,1)

--选修表
insert into student_Selective(sno,cno,grade,point)
            values('200001','cn007',85,3.5),
			      ('200001','cn008',72,2),
				  ('200001','cn009',66,1.5),
				  ('200001','cn010',91,4),
				  ('200001','cn011',82,3),
				  ('200001','cn012',60,1),
				  ('200002','cn007',85,3.5),
			      ('200002','cn008',72,2),
				  ('200002','cn009',66,1.5),
				  ('200002','cn010',91,4),
				  ('200002','cn011',82,3),
				  ('200002','cn012',60,1)

--开设课表
insert into class_compulsory(cno,class_no,start_date)
            values('cn001','C001','2022-09-01'),
			      ('cn002','C001','2022-09-01'),
				  ('cn003','C001','2022-09-01'),
				  ('cn004','C001','2022-09-01'),
				  ('cn005','C001','2022-09-01'),
				  ('cn006','C001','2022-09-01'),
				  ('cn001','C002','2022-09-01'),
				  ('cn002','C002','2022-09-01'),
				  ('cn003','C002','2022-09-01'),
				  ('cn004','C002','2022-09-01'),
				  ('cn005','C002','2022-09-01'),
				  ('cn006','C002','2022-09-01')

--8数据查询
--（1）给定学号，按学号查询指定学生的基本信息
select * from student where sno = '200007'

--（2）给定姓名，按姓名查询指定学生的基本信息
select * from student where sname = '杰哥'

--（3）给定课程号，按课程号查询指定课程的基本信息
select * from Course where cno = 'cn001'

--（4）给定课程名，按课程名查询指定课程的基本信息
select * from course where cname = '数据库原理'

--（5）给定学号和课程名，按学号和课程号查询指定学生所修指定课程的成绩和学分绩点
select grade,point from student s,course c,student_Selective ss
where s.sno = ss.sno and c.cno = ss.cno and s.sno = '200001' and c.cno = 'cn004'
union
select grade,point from student s,course c,student_compulsory sc
where s.sno = sc.sno and c.cno = sc.cno and s.sno = '200004' and c.cno = 'cn001'

--（6）给定学号，按学号查询指定学生所修全部课程的课程名、成绩和学分绩点。要求使用所建立的“学生成绩” 视图
select * 
from 学生成绩
where sno = '200001'

--（7）给定班级和课程名，按班级和课程号查询指定班级所有学生选修指定课程的成绩，查询结果以学号、姓名、成绩、学分绩点的形式显示。
--要求使用所建立的“学生成绩” 视图
select sno,sname,grade,point
from 学生成绩 sg,course c
where sg.cname = c.cname and class_name = '计科02' and c.cno = 'cn001'

--（8）查询每个学生的学分绩点的总和和平均学分绩点
select sno,sum(point) '绩点总和',avg(point) '平均学分绩点'
from 学生成绩
group by sno	

--9数据更新
--（1）插入一个学生的基本信息
insert into student values('200023','二毛','女',18,'C002')

select * from student

--（2）插入一门课程的基本信息
insert into course values('cn025','操作系统',5,48,'公共必修课','第三学期')

select * from course

--（3）插入一个学生某一门课的成绩
insert into student_compulsory values('200001','cn004',90,2)

select * from student_compulsory

--（4）给定学号，按学号修改指定学生的基本信息
update student set sname = '大黑',sage=20 where sno = '200001'

select * from student

--（5）给定课程号，按课程号修改指定课程的基本信息
update course set cname = '唱跳rap' where cno = 'cn007'

select * from course

--（6）给定学号和课程名，按学号和课程名修改指定学生所修指定课程的成绩
update student_compulsory set grade = '64' where sno = '200006' and cno = 'cn002'

select * from student_compulsory

--（7）给定学号，按学号删除指定学生的基本信息及修课信息
delete from student_Selective where sno = '200001'

select * from student_Selective 

--（8）给定学号和课程名，按学号和课程名删除指定学生所修指定课程及成绩信息
delete from student_compulsory where sno = '200002' and cno = 'cn002'

select * from student_compulsory

--10数据控制