数据库 基础学习8— 横标与纵表转换

 1 create table  Student--学生表
 2 (
 3     Sno char(3) primary key not null,--学号（主键）
 4     Sname char(8) not null,--学生姓名
 5     Ssex char(2) not null,--学生性别
 6     Sbirthday datetime,--学生出生年月
 7     Class char(5)--学生所在班级
 8 )
 9 go
10 create table Teacher--教师表
11 (
12     Tno char(3) not null primary key,--教工编号（主码）
13     Tname    Char(4)    not null,--教工姓名
14     Tsex    Char(2)    not null,--教工性别
15     Tbirthday    datetime check(Tbirthday>‘1900-1-1‘),--教工出生年月    
16     Prof    Char(6),--职称
17     Depart    Varchar(10)    not null--教工所在部门
18 )
19 go
20 create table Course--课程表
21 (
22     Cno char(5) primary key not null,--课程号（主键）
23     Cname varchar(10) not null,--课程名称
24     Tno char(3) not null references Teacher(Tno)--教工编号（外键）
25 )
26 go
27 create table Score--成绩表
28 (
29     primary key (Sno,Cno),
30     Sno char(3) not null references Student(Sno),--学号（外键）
31     Cno char(5) not null references Course(Cno),--课程号（外键）
32     Degree decimal(4,1)--成绩
33 )
34 insert into Student values(‘108‘,‘曾华‘,‘男‘,‘1977-09-01‘,‘95033‘)
35 insert into Student values(‘105‘,‘匡明‘,‘男‘,‘1975-10-02‘,‘95031‘)
36 insert into Student values(‘107‘,‘王丽‘,‘女‘,‘1976-01-23‘,‘95033‘)
37 insert into Student values(‘101‘,‘李军‘,‘男‘,‘1976-02-20‘,‘95033‘)
38 insert into Student values(‘109‘,‘王芳‘,‘女‘,‘1975-02-10‘,‘95031‘)
39 insert into Student values(‘103‘,‘陆君‘,‘男‘,‘1974-06-03‘,‘95031‘)
40 
41 update Student set Class=‘95031‘ where Sno=‘103‘
42 update Student set Class=‘95033‘ where Sno=‘108‘
43 update Student set Class=‘95031‘ where Sno=‘109‘
44 update Student set Class=‘95031‘ where Sno=‘105‘
45 
46 
47 select *from Student
48 
49 insert into Teacher values(‘804‘,    ‘李诚‘,    ‘男‘,    ‘1958-12-02‘,    ‘副教授‘,    ‘计算机系‘)  
50 insert into Teacher values(‘856‘,    ‘张旭‘,    ‘男‘,    ‘1969-03-12‘,    ‘讲师‘,    ‘电子工程系‘)  
51 insert into Teacher values(‘825‘,    ‘王萍‘,    ‘女‘,    ‘1972-05-05‘,    ‘助教‘,    ‘计算机系‘)  
52 insert into Teacher values(‘831‘,    ‘刘冰‘,    ‘女‘,    ‘1977-08-14‘,    ‘助教‘,    ‘电子工程系‘)  
53 
54 select *from  Teacher 
55 
56 insert into Course values(‘3-105‘,‘计算机导论‘,‘825‘)  
57 insert into Course values(‘3-245‘,‘操作系统‘,‘804‘) 
58 insert into Course values(‘6-166‘,‘数字电路‘,‘856‘) 
59 insert into Course values(‘9-888‘,‘高等数学‘,‘831‘) 
60 
61 select *from Course
62 
63 insert into Score values(‘103‘,    ‘3-245‘,    86) 
64 insert into Score values(‘105‘,    ‘3-245‘,    75) 
65 insert into Score values(‘109‘,    ‘3-245‘,    68) 
66 insert into Score values(‘103‘,    ‘3-105‘,    92) 
67 insert into Score values(‘105‘,    ‘3-105‘,    88) 
68 insert into Score values(‘109‘,    ‘3-105‘,    76) 
69 insert into Score values(‘101‘,    ‘3-105‘,    64) 
70 insert into Score values(‘107‘,    ‘3-105‘,    91) 
71 insert into Score values(‘108‘,    ‘3-105‘,    78) 
72 insert into Score values(‘101‘,    ‘6-166‘,    85) 
73 insert into Score values(‘107‘,    ‘6-166‘,    79) 
74 insert into Score values(‘108‘,    ‘6-166‘,    81) 
75 
76 insert into Score values(‘103‘,    ‘6-166‘,    81) 
77 insert into Score values(‘105‘,    ‘6-166‘,    81) 
78 insert into Score values(‘109‘,    ‘6-166‘,    81) 
79 
80 delete from Score where Sno=109 and cno=‘6-166‘
81 
82 
83 select  COUNT(*) from Score
84 
85 select *from Score
86 update Score set degree=‘64‘ where Sno=101 and cno=‘3-105‘
87 update Score set degree=‘85‘ where Sno=101 and cno=‘6-166‘
88 delete from Score where Sno=107 and cno=‘6-166‘