当前位置：网站首页>Database experiment report (II)

Database experiment report (II)

2022-07-01 10:46:00 【Billy Miracle】

One 、 The experiment purpose

master SQL Basic specification of programming , Skilled use SQL Language to achieve basic data query , Including single table query 、 Grouping statistical query and connection query . Master the use of view . master SQL Design methods of various advanced queries such as nested queries and set queries . Familiar with database data update operation , Able to use SQL Statement to insert data into the database 、 modify 、 Delete operation . be familiar with SQL Language about view operation , Be able to use SQL Statement to create the desired view , Define the schema outside the database , And can use the created view to realize data management .

Two 、 Experimental content

Inquire about SC All the data in the table .
Check the name and age of computer students
The results are in 70～80 The student number of the student 、 Course number and grades
The age of the computer department is in 18～20 Name and age of male student aged
Inquire about C001 The highest score of the course
Query the maximum age and minimum age of computer students
Count the number of students in each department
Count the number of candidates and the highest grades of each course
Calculate the number of courses selected by each student and the total score of the exam , And display the results in ascending order according to the number of courses selected
List total scores exceeding 200 Student number and total score of students
The query selected C002 Name and Department of students in the course
Check the test results 80 Names of students with scores above 、 Course number and grades , And arrange the results in descending order
Query and VB The course name and semester of the course offered in the same semester
Query the names of students of the same age as Li Yong 、 Age and department
Check which courses no students choose , List the course number and course name
Check the course selection of each student , Including students who did not choose courses , List the student number 、 full name 、 Selected course number
Check which students in the computer department did not choose courses , List student names
Check the names and ages of the three oldest students in the computer department ,top 3
List “VB” Student number of the top three students in the course examination 、 full name 、 Department and VB achievement ,top3
Query the top students with the largest number of courses 2 Students , List the student number and the number of courses selected , top 2
Inquire about the results of the Department of Communication Engineering 80 Student number and name of the above students
Query the names of students whose examination scores of computer department students are higher than the average scores of computer department students 、 The course name and examination result of the exam
Count the number of students selected for each course , Including courses with candidates and courses without candidates , List course number , The number of students and the situation of course selection , The course selection is ： If the number of candidates for this course exceeds 100 people , Is displayed “ More people ”; If the number of candidates for this course is 40～100, Is displayed “ commonly ”; If the number of candidates for this course is 1～40, Is displayed “ Fewer people ”; If there is no candidate for this course , Is displayed “ No candidate ”.
Delete the basic information of courses without candidates
Contains the student's student number 、 full name 、 Department 、 Age , Course no. 、 Course name 、 View of course credits
Contains the student's student number 、 full name 、 View of elective course names and examination scores
Count the number of students in each course , It is required to list the student number and the number of courses selected
Count the total credits of each student , It is required to list the view of student student number and total credits （ explain ： The examination result is greater than or equal to 60 To get credits for this course ）.
Use the view to query that the exam score is greater than or equal to 90 The names of the students 、 Course name and grade .
Use the view to query the number of courses selected exceeds 3 The student number and the number of courses selected by the students of the course .
Using the view to query the number of courses selected by the computer department exceeds 3 The name of the student and the number of courses selected .
Use the view to query the total credits of courses more than 10 The student number of the student 、 full name 、 Total credits of department and courses .
Use the view to query whether the age is greater than or equal to 20 Among the students aged , The total credits of courses are more than 10 The names of the students 、 Age 、 Total credits of department and courses .
Create another “ Department of Computer Science ” Student number of the student 、 full name 、 Department 、 Age , Course no. 、 Course name 、 View of course credits .
Add a record ,
0841101 Zhang Xin Department of Computer Science 20 C001 Advanced mathematics 4
Modify this record as
0841101 Zhang Xin physics department 20 C001 Advanced mathematics 4

3、 ... and 、 Experimental environment

MySQL、Navicat 15 for MySQL

Four 、 Preparation before experiment

experimental data , Use the tables and data created in the first experiment

5、 ... and 、 The experimental steps

Inquire about SC All the data in the table .
Check the name and age of computer students , And use an alias
The results are in 70～80 The student number of the student 、 Course number and grades
The age of the computer department is in 18～20 Name and age of male student aged
Inquire about C001 The highest score of the course
Query the maximum age and minimum age of computer students
Count the number of students in each department
Count the number of candidates and the highest grades of each course
Calculate the number of courses selected by each student and the total score of the exam , And display the results in ascending order according to the number of courses selected
List total scores exceeding 200 Student number and total score of students
The query selected C002 Name and Department of students in the course
Check the test results 80 Names of students with scores above 、 Course number and grades , And arrange the results in descending order
Query and VB The course name and semester of the course offered in the same semester
Query the names of students of the same age as Li Yong 、 Age and department
Check which courses no students choose , List the course number and course name
Check the course selection of each student , Including students who did not choose courses , List the student number 、 full name 、 Selected course number
Check which students in the computer department did not choose courses , List student names
Check the names and ages of the three oldest students in the computer department ,top 3
List “VB” Student number of the top three students in the course examination 、 full name 、 Department and VB achievement ,top3
Query the top students with the largest number of courses 2 Students , List the student number and the number of courses selected , top 2
Inquire about the results of the Department of Communication Engineering 80 Student number and name of the above students
Query the names of students whose examination scores of computer department students are higher than the average scores of computer department students 、 The course name and examination result of the exam
Count the number of students selected for each course , Including courses with candidates and courses without candidates , List course number , The number of students and the situation of course selection , The course selection is ： If the number of candidates for this course exceeds 100 people , Is displayed “ More people ”; If the number of candidates for this course is 40～100, Is displayed “ commonly ”; If the number of candidates for this course is 1～40, Is displayed “ Fewer people ”; If there is no candidate for this course , Is displayed “ No candidate ”.
Delete the basic information of courses without candidates
Contains the student's student number 、 full name 、 Department 、 Age , Course no. 、 Course name 、 View of course credits
Contains the student's student number 、 full name 、 View of elective course names and examination scores
Count the number of students in each course , It is required to list the student number and the number of courses selected
Count the total credits of each student , It is required to list the view of student student number and total credits （ explain ： The examination result is greater than or equal to 60 To get credits for this course ）.
Use the view to query that the exam score is greater than or equal to 90 The names of the students 、 Course name and grade .
Use the view to query the number of courses selected exceeds 3 The student number and the number of courses selected by the students of the course .
Using the view to query the number of courses selected by the computer department exceeds 3 The name of the student and the number of courses selected
Use the view to query the total credits of courses more than 10 The student number of the student 、 full name 、 Total credits of department and courses .
Use the view to query whether the age is greater than or equal to 20 Among the students aged , The total credits of courses are more than 10 The names of the students 、 Age 、 Total credits of department and courses .
Create another “ Department of Computer Science ” Student number of the student 、 full name 、 Department 、 Age , Course no. 、 Course name 、 View of course credits .
Add a record ,
0841101 Zhang Xin Department of Computer Science 20 C001 Advanced mathematics 4
Modify this record as
0841101 Zhang Xin physics department 20 C001 Advanced mathematics 4

6、 ... and 、 experimental result

Inquire about SC All the data in the table .
Check the name and age of computer students
The results are in 70～80 The student number of the student 、 Course number and grades
The age of the computer department is in 18～20 Name and age of male student aged
Inquire about C001 The highest score of the course
Query the maximum age and minimum age of computer students
Count the number of students in each department
Count the number of candidates and the highest grades of each course
Calculate the number of courses selected by each student and the total score of the exam , And display the results in ascending order according to the number of courses selected
List total scores exceeding 200 Student number and total score of students
The query selected C002 Name and Department of students in the course
Check the test results 80 Names of students with scores above 、 Course number and grades , And arrange the results in descending order
Query and VB The course name and semester of the course offered in the same semester
Query the names of students of the same age as Li Yong 、 Age and department
Check which courses no students choose , List the course number and course name
Check the course selection of each student , Including students who did not choose courses , List the student number 、 full name 、 Selected course number
Check which students in the computer department did not choose courses , List student names
Check the names and ages of the three oldest students in the computer department ,top 3
List “VB” Student number of the top three students in the course examination 、 full name 、 Department and VB achievement ,top3
Query the top students with the largest number of courses 2 Students , List the student number and the number of courses selected , top 2
Inquire about the results of the Department of Communication Engineering 80 Student number and name of the above students
Query the names of students whose examination scores of computer department students are higher than the average scores of computer department students 、 The course name and examination result of the exam
Count the number of students selected for each course , Including courses with candidates and courses without candidates , List course number , The number of students and the situation of course selection , The course selection is ： If the number of candidates for this course exceeds 100 people , Is displayed “ More people ”; If the number of candidates for this course is 40～100, Is displayed “ commonly ”; If the number of candidates for this course is 1～40, Is displayed “ Fewer people ”; If there is no candidate for this course , Is displayed “ No candidate ”.
Delete the basic information of courses without candidates
Contains the student's student number 、 full name 、 Department 、 Age , Course no. 、 Course name 、 View of course credits
Contains the student's student number 、 full name 、 View of elective course names and examination scores
Count the number of students in each course , It is required to list the student number and the number of courses selected
Count the total credits of each student , It is required to list the view of student student number and total credits （ explain ： The examination result is greater than or equal to 60 To get credits for this course ）.
Use the view to query that the exam score is greater than or equal to 90 The names of the students 、 Course name and grade .
Use the view to query the number of courses selected exceeds 3 The student number and the number of courses selected by the students of the course .
Using the view to query the number of courses selected by the computer department exceeds 3 The name of the student and the number of courses selected .
Use the view to query the total credits of courses more than 10 The student number of the student 、 full name 、 Total credits of department and courses .
Use the view to query whether the age is greater than or equal to 20 Among the students aged , The total credits of courses are more than 10 The names of the students 、 Age 、 Total credits of department and courses .
Create another “ Department of Computer Science ” Student number of the student 、 full name 、 Department 、 Age , Course no. 、 Course name 、 View of course credits .
Add a record ,
0841101 Zhang Xin Department of Computer Science 20 C001 Advanced mathematics 4
Modify this record as
0841101 Zhang Xin physics department 20 C001 Advanced mathematics 4