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开始稍微系统点的联系,难度不断增加,持续更新

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 1 create database Sprise
 2 use Sprise
 3 go
 4 
 5 create table Student
 6 (
 7 Sno nvarchar(200) primary key not null,
 8 Sname nvarchar(200) not null,
 9 Ssex nvarchar(200) not null,
10 Sbirthday datetime ,
11 Class nvarchar(200) ,
12 
13 )
14 
15 go
16 
17 create table Course
18 (
19 Cno nvarchar(200) primary key not null,
20 Cname nvarchar(200) not null,
21 Tno nvarchar(200) not null,
22 )
23 
24 go
25 
26 create table Score
27 (
28 Sno nvarchar(200) not null,
29 Cno nvarchar(200) not null,
30 Degree decimal(4,1) ,
31 )
32 
33 go
34 
35 create table Teacher
36 (
37 Tno nvarchar(200) primary key not null,
38 Tname nvarchar(200) not null,
39 Tsex nvarchar(200) not null,
40 Tbirthday datetime ,
41 Prof nvarchar(200) ,
42 Depart nvarchar(200) not null,
43 )
44 
45 --select *from Teacher
46 
47 
48 insert into Student values(108,曾华,,1997-09-01,95003)
49 insert into Student values(105,匡华,,1975-10-12,95031)
50 insert into Student values(107,王丽,,1976-10-23,95033)
51 insert into Student values(101,李军,,1974-10-12,95033)
52 insert into Student values(109,王芳,,1973-10-12,95031)
53 insert into Student values(103,陆君,,1972-10-12,95031)
54 
55 go
56 
57 
58 insert into Course values(3-105,计算机导论,825)
59 insert into Course values(3-245,操作系统,804)
60 insert into Course values(6-166,数字电路,856)
61 insert into Course values(9-888,高等数学,831)
62 
63 go
64 
65 insert into Score values(103,3-245,86)
66 insert into Score values(105,3-245,75)
67 insert into Score values(101,3-245,90)
68 insert into Score values(105,3-105,77)
69 insert into Score values(103,3-105,88)
70 insert into Score values(107,9-888,72)
71 insert into Score values(107,3-245,66)
72 insert into Score values(109,3-245,71)
73 insert into Score values(103,9-888,89)
74 insert into Score values(108,3-245,96)
75 
76 go
77 
78 insert into Teacher values(804,李成,,1958-12-20,副教授,计算机系)
79 insert into Teacher values(825,李三,,1958-11-20,副教授,电子工程系)
80 insert into Teacher values(856,赵四,,1958-09-20,副教授,计算机系)
81 insert into Teacher values(831,鼠标,,1958-07-20,副教授,电子工程系)
82 
83 
84 
85 alter table Score add constraint S_Sc_Sno foreign key (Sno) references Student(Sno)
86 alter table Score add constraint C_Sc_Cno foreign key (Cno) references Course(Cno)
87 alter table Course add constraint T_C_Tno foreign key (Tno) references Teacher(Tno)

重复重复的去熟悉  其实不需要特殊记忆

开始稍微系统点的联系,难度不断增加,持续更新