13)查询每门课程获得最高分的同学的学号、姓名、课程名称和成绩,并按照最高成绩从高到低进行排序。<
时间: 2024-03-25 14:36:54 浏览: 546
可以使用如下 SQL 语句来查询每门课程获得最高分的同学的学号、姓名、课程名称和成绩,并按照最高成绩从高到低进行排序:
```
SELECT s.id, s.name, c.course_name, MAX(sc.score) AS max_score
FROM students s
JOIN score sc ON s.id = sc.student_id
JOIN courses c ON sc.course_id = c.id
WHERE sc.score = (
SELECT MAX(score)
FROM score
WHERE course_id = sc.course_id
)
GROUP BY c.id
ORDER BY max_score DESC;
```
其中,students 表存储学生信息,包括 id 和 name 字段;courses 表存储课程信息,包括 id 和 course_name 字段;score 表存储学生成绩信息,包括 student_id、course_id 和 score 字段。上述 SQL 语句使用了子查询和 GROUP BY 子句来查询每门课程的最高成绩,并按照最高成绩进行排序。
相关问题
(10)查询选修了4门及以上课程的学生的学号、姓名和选修课程数。 (11) 查询选修全部课程的学生姓名,相当于查询这样的学生,没有一门课程是他不选的。 (12) 查询平均成绩大于等于黄河同学的平均成绩的学生的学号、姓名和平均成绩。 (13)查询每门课程获得最高分的同学的学号、姓名、课程名称和成绩,并按照最高成绩从高到低进行排序。数据库代码
下面是针对您提出的问题的数据库查询代码:
(10) 查询选修了4门及以上课程的学生的学号、姓名和选修课程数。
```sql
SELECT s.student_id, s.student_name, COUNT(*) AS course_num
FROM student s INNER JOIN course_selection cs ON s.student_id = cs.student_id
GROUP BY s.student_id, s.student_name
HAVING COUNT(*) >= 4;
```
(11) 查询选修全部课程的学生姓名,相当于查询这样的学生,没有一门课程是他不选的。
```sql
SELECT s.student_name
FROM student s LEFT JOIN course c ON NOT EXISTS (
SELECT *
FROM course
WHERE course_id NOT IN (
SELECT course_id
FROM course_selection
WHERE student_id = s.student_id
)
)
```
(12) 查询平均成绩大于等于黄河同学的平均成绩的学生的学号、姓名和平均成绩。
```sql
SELECT s.student_id, s.student_name, AVG(cs.score) AS avg_score
FROM student s INNER JOIN course_selection cs ON s.student_id = cs.student_id
WHERE AVG(cs.score) >= (
SELECT AVG(score)
FROM course_selection
WHERE student_id = '黄河'
)
GROUP BY s.student_id, s.student_name;
```
(13) 查询每门课程获得最高分的同学的学号、姓名、课程名称和成绩,并按照最高成绩从高到低进行排序。
```sql
SELECT s.student_id, s.student_name, c.course_name, MAX(cs.score) AS max_score
FROM student s INNER JOIN course_selection cs ON s.student_id = cs.student_id
INNER JOIN course c ON cs.course_id = c.course_id
WHERE cs.score = (
SELECT MAX(score)
FROM course_selection
WHERE course_id = cs.course_id
)
GROUP BY s.student_id, s.student_name, c.course_name, cs.score
ORDER BY cs.score DESC;
```
(1)查询选修课程号为C01,并且成绩及格的学生学号、姓名和系别名称。 (2)查询计算机学院选修C03课程的学生姓名、课程名称以及这门课程的成绩。(3)在Reports表中查询至少选修课了程号为C01和C02的学生学号和姓名。(4)查询既没有选修课程号C01,也没有选修课程号C02的学生的学号和姓名。(5) 查询每个同学基本信息及其选修课程的情况。(6)查询每个学生及其选修课程的情况(若某一个学生没有选课,只输出学生的基本情况信息,其选课信息为空值)。 (7)查询选修了课程名为“GIS开发”的学生学号和姓名。(8) 查询没有选修C02课程的学生学号和姓名。 (9)查询所有课程成绩均大于90分的学生学号和姓名。(10)查询选修了4门及以上课程的学生的学号、姓名和选修课程数。(11) 查询选修全部课程的学生姓名,相当于查询这样的学生,没有一门课程是他不选的。 (12) 查询平均成绩大于等于黄河同学的平均成绩的学生的学号、姓名和平均成绩。(13)查询每门课程获得最高分的同学的学号、姓名、课程名称和成绩,并按照最高成绩从高到低进行排序。
很好,您的问题是关于 SQL 语句的。以下是您提出的问题的 SQL 查询语句:
(1)查询选修课程号为C01,并且成绩及格的学生学号、姓名和系别名称。
```
SELECT StudentID, StudentName, DepartmentName
FROM Student, Department, SC
WHERE Student.StudentID = SC.StudentID
AND SC.CourseID = 'C01'
AND SC.Score >= 60
AND Student.DepartmentID = Department.DepartmentID;
```
(2)查询计算机学院选修C03课程的学生姓名、课程名称以及这门课程的成绩。
```
SELECT StudentName, CourseName, Score
FROM Student, Course, SC, Department
WHERE Student.StudentID = SC.StudentID
AND Course.CourseID = SC.CourseID
AND Department.DepartmentID = Student.DepartmentID
AND Department.DepartmentName = '计算机学院'
AND Course.CourseID = 'C03';
```
(3)在Reports表中查询至少选修课了程号为C01和C02的学生学号和姓名。
```
SELECT StudentID, StudentName
FROM Reports
WHERE CourseID IN ('C01','C02')
GROUP BY StudentID, StudentName
HAVING COUNT(DISTINCT CourseID) >= 2;
```
(4)查询既没有选修课程号C01,也没有选修课程号C02的学生的学号和姓名。
```
SELECT StudentID, StudentName
FROM Student
WHERE StudentID NOT IN (
SELECT StudentID
FROM SC
WHERE CourseID IN ('C01','C02')
);
```
(5)查询每个同学基本信息及其选修课程的情况。
```
SELECT Student.StudentID, Student.StudentName, Student.Gender, Student.Birthday, Student.Address, Department.DepartmentName, SC.CourseID, Course.CourseName, SC.Score
FROM Student
LEFT JOIN SC ON Student.StudentID = SC.StudentID
LEFT JOIN Course ON SC.CourseID = Course.CourseID
LEFT JOIN Department ON Student.DepartmentID = Department.DepartmentID
ORDER BY Student.StudentID, SC.CourseID;
```
(6)查询每个学生及其选修课程的情况(若某一个学生没有选课,只输出学生的基本情况信息,其选课信息为空值)。
```
SELECT Student.StudentID, Student.StudentName, Student.Gender, Student.Birthday, Student.Address, Department.DepartmentName, SC.CourseID, Course.CourseName, SC.Score
FROM Student
LEFT JOIN SC ON Student.StudentID = SC.StudentID
LEFT JOIN Course ON SC.CourseID = Course.CourseID
LEFT JOIN Department ON Student.DepartmentID = Department.DepartmentID
ORDER BY Student.StudentID, SC.CourseID;
```
(7)查询选修了课程名为“GIS开发”的学生学号和姓名。
```
SELECT Student.StudentID, Student.StudentName
FROM Student, SC, Course
WHERE Student.StudentID = SC.StudentID
AND SC.CourseID = Course.CourseID
AND Course.CourseName = 'GIS开发';
```
(8)查询没有选修C02课程的学生学号和姓名。
```
SELECT Student.StudentID, Student.StudentName
FROM Student
WHERE Student.StudentID NOT IN (
SELECT StudentID
FROM SC
WHERE CourseID = 'C02'
);
```
(9)查询所有课程成绩均大于90分的学生学号和姓名。
```
SELECT StudentID, StudentName
FROM SC, Student
WHERE SC.StudentID = Student.StudentID
AND Score >= 90
GROUP BY StudentID, StudentName
HAVING COUNT(DISTINCT CourseID) = (
SELECT COUNT(DISTINCT CourseID)
FROM Course
);
```
(10)查询选修了4门及以上课程的学生的学号、姓名和选修课程数。
```
SELECT StudentID, StudentName, COUNT(*) AS CourseCount
FROM SC, Student
WHERE SC.StudentID = Student.StudentID
GROUP BY StudentID, StudentName
HAVING COUNT(*) >= 4;
```
(11)查询选修全部课程的学生姓名,相当于查询这样的学生,没有一门课程是他不选的。
```
SELECT Student.StudentName
FROM Student
WHERE NOT EXISTS (
SELECT CourseID
FROM Course
WHERE NOT EXISTS (
SELECT SC.StudentID
FROM SC
WHERE SC.StudentID = Student.StudentID
AND SC.CourseID = Course.CourseID
)
);
```
(12)查询平均成绩大于等于黄河同学的平均成绩的学生的学号、姓名和平均成绩。
```
SELECT AVG(SC.Score) AS AvgScore, Student.StudentID, Student.StudentName
FROM SC, Student
WHERE SC.StudentID = Student.StudentID
GROUP BY Student.StudentID, Student.StudentName
HAVING AVG(SC.Score) >= (
SELECT AVG(SC.Score)
FROM SC, Student
WHERE SC.StudentID = Student.StudentID
AND Student.StudentName = '黄河'
);
```
(13)查询每门课程获得最高分的同学的学号、姓名、课程名称和成绩,并按照最高成绩从高到低进行排序。
```
SELECT SC.StudentID, Student.StudentName, Course.CourseName, MAX(SC.Score) AS MaxScore
FROM SC, Student, Course
WHERE SC.StudentID = Student.StudentID
AND SC.CourseID = Course.CourseID
GROUP BY SC.CourseID
ORDER BY MaxScore DESC;
```
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