Database experiment report (I)

One 、 The experiment purpose

Understand and master the database DDL Language , Able to use SQL DDL Statement to create, modify and delete the database 、 Patterns and tables .

Two 、 Experimental content

use SQL Define a statement to create a table that meets the following conditions C-1 To C-4（ Pay attention to various integrity constraints ）
surface C-1 Student Table structure

 Name   explain   data type   constraint 
Sno  Student number   Regular encoded fixed length string , The length is 7  Primary key 
Sname  full name   Regular encoded fixed length string , The length is 10
Ssex  Gender   Regular encoded fixed length string , The length is 2
Sage  Age   Microinteger （tinyint）
Sdept  Department   Ordinary encoded indefinite length string , The length is 20
Sid  ID number   Regular encoded fixed length string , The length is 10
Sdate  Date of admission   date 

surface C-2 Course Table structure

 Name   explain   data type   constraint 
Cno  Course no.   Regular encoded fixed length string , The length is 10  Primary key 
Cname  Course name   Ordinary encoded indefinite length string , The length is 20
Credit  Class hours   integer 
Semester  credits   Small integer 

surface C-3 SC Table structure

 Name   explain   data type   constraint 
Sno  Student number   Regular encoded fixed length string , The length is 7  Primary key , quote Student The foreign key 
Cno  Course no.   Regular encoded fixed length string , The length is 10  Primary key , quote Course The foreign key 
Grade  achievement   Small integer 

surface C-4 Teacher Table structure

 Name   explain   data type   constraint 
Tno  Teacher number   Regular encoded fixed length string , The length is 8
Tname  Teacher's name   Regular encoded fixed length string , The length is 10
Salary  Wages   Fixed point decimals , Before the decimal point 4 position , After the decimal point 2 position 

surface C-1 Student Table data

 Student number   full name   Gender   Age   Is don't   ID number   Date of admission 
0811101  Li Yong   male  21  Department of Computer Science 
0811102  Liu Chen   male  20  Department of Computer Science 
0811103  Wang min.   Woman  20  Department of Computer Science 
0811104  Zhang Xiaohong   Woman  19  Department of Computer Science 
0821101  Zhang Li   male  20  Information management department 
0821102  Wu Bin   Woman  19  Information management department 
0821103  Zhang Hai   male  20  Information management department 
0831101  Qian Xiaoping   Woman  21  Department of communication engineering 
0831102  Wang Dali   male  20  Department of communication engineering 
0831103  Zhang Shanshan   Woman  19  Department of communication engineering 

surface C-2 Course The records in the table

Cno Cname Credit Semester
C001  Advanced mathematics  4 1
C002  College English  3 1
C003  College English  3 2
C004  Computer culture  2 2
C005 VB 2 3
C006  Database foundation  4 5
C007  data structure  4 4
C008  computer network  4 4

surface C-3 SC The records in the table

Sno Cno Grade
0811101 C001 96
0811101 C002 80
0811101 C003 84
0811101 C005 62
0811102 C001 92
0811102 C002 90
0811102 C004 84
0821102 C001 76
0821102 C004 86
0821102 C005 73
0821102 C007 NULL
0821103 C001 50
0821103 C004 80
0831101 C001 50
0831101 C004 80
0831102 C007 NULL
0831103 C004 78
0831103 C005 65
0831103 C007 NULL

surface C-4 Teacher The records in the table

Tno Tname Salary
T001  Zhang MEIXIA  5000
T002  Wang Honglin  5500
T003  Lilifen  4800
T004  Zhou Liangshui  6000
T005  Wu Xiang  7000

3、 ... and 、 Experimental environment

MySQL、Navicat 15 for MySQL

Four 、 Preparation before experiment

experimental data , Written in the experimental content .

5、 ... and 、 The experimental steps

Create the database first ：
Creat Database
Next, create a student table ：

Create schedule ：

Create a course selection list , And two foreign keys （Foreign Key）, Separate Association student Tabular Sno and course Tabular Cno：

Create a teacher list ：

Next, let's look at the design of each table ：




Next, add data ：
Because there are two columns of student table data without , So write each value The corresponding column .

Schedule data ：

Course selection table data ：

Teacher table data ：

Next, I practiced a few operations about users ：

Constrained learning ：
Put the learned code directly ：

6、 ... and 、 experimental result

student、course、sc、teacher Several tables are created , Expect the data to be added successfully .
Use of integrity ： Use primary key constraint when creating

Change student name , Make it non empty ：