检索选修三号课程的学生姓名学sql
时间: 2024-07-07 11:00:53 浏览: 341
在SQL中,要检索选修"选修三号"课程的学生姓名,假设我们有一个名为"students"的表,其中包含"student_id", "name"(姓名)和"courses"(选修课程)字段,你可以使用以下查询:
```sql
SELECT name
FROM students
WHERE courses LIKE '%选修三号%';
```
这个查询会返回所有选修了包含"选修三号"的课程的学生姓名。请注意,这个查询假设"courses"字段是一个字符串类型,记录了学生所选的所有课程,可能以某种格式如逗号分隔。
相关问题
根据上面的对话检索“程军”老师所授课程的课程号和课程名。 (3)检索年龄大于19岁男学生的学号和姓名。 (4)检索“李勇”同学不学课程的课程号。 (5)检索至少选修两门课程的学生学号。 (6)检索选修课程号为1和2的学生学号。 (7)检索至少选修“程军”老师所授全部课程的学生姓名。 (8)检索选修课程包含学号为201215122的学生所修课程的学生学号。 (9)检索全部学生都选修的课程的课程号和课程名。 (10)检索选修全部课程的学生姓名。 (11)查询所在系是CS系的学生选修的课程的课程名和学分,结果按课程名降序排序。 (12)检索“数据库”课程成绩高于90分的所有学生的学号、姓名和分数. (13)查询男生和女生选修课程的平均成绩。 (14)检索没有选课的学生的学号和姓名。 (15)检索没有任何一门课程成绩不及格的学生的信息,包括学号、姓名
很抱歉,作为语言模型,我不能直接连接数据库进行数据检索。但是,我可以提供一些 SQL 查询语句的示例,您可以根据这些示例进行相应的查询操作:
1. 检索“程军”老师所授课程的课程号和课程名:
```
SELECT Cno, Cname
FROM Course
WHERE Cpno IN (SELECT Cno FROM Course WHERE Cname = '程军');
```
2. 检索年龄大于19岁男学生的学号和姓名:
```
SELECT Sno, Sname
FROM Student
WHERE Ssex = '男' AND Sage > 19;
```
3. 检索“李勇”同学不学课程的课程号:
```
SELECT Cno
FROM Course
WHERE Cno NOT IN (SELECT Cno FROM SC WHERE Sno = (SELECT Sno FROM Student WHERE Sname = '李勇'));
```
4. 检索至少选修两门课程的学生学号:
```
SELECT Sno
FROM SC
GROUP BY Sno
HAVING COUNT(*) >= 2;
```
5. 检索选修课程号为1和2的学生学号:
```
SELECT Sno
FROM SC
WHERE Cno IN ('1', '2');
```
6. 检索至少选修“程军”老师所授全部课程的学生姓名:
```
SELECT Sname
FROM Student
WHERE Sno IN (SELECT Sno FROM SC WHERE Cno IN (SELECT Cno FROM Course WHERE Cpno IN (SELECT Cno FROM Course WHERE Cname = '程军'))
GROUP BY Sno
HAVING COUNT(*) = (SELECT COUNT(*) FROM Course WHERE Cpno IN (SELECT Cno FROM Course WHERE Cname = '程军')));
```
7. 检索选修课程包含学号为201215122的学生所修课程的学生学号:
```
SELECT DISTINCT Sno
FROM SC
WHERE Cno IN (SELECT Cno FROM SC WHERE Sno = '201215122');
```
8. 检索全部学生都选修的课程的课程号和课程名:
```
SELECT Cno, Cname
FROM Course
WHERE Cno IN (SELECT Cno FROM SC GROUP BY Cno HAVING COUNT(*) = (SELECT COUNT(*) FROM Student));
```
9. 检索选修全部课程的学生姓名:
```
SELECT Sname
FROM Student
WHERE Sno IN (SELECT Sno FROM SC GROUP BY Sno HAVING COUNT(*) = (SELECT COUNT(*) FROM Course));
```
10. 查询所在系是CS系的学生选修的课程的课程名和学分,结果按课程名降序排序:
```
SELECT C.Cname, C.Ccreadit
FROM SC AS S
JOIN Course AS C ON S.Cno = C.Cno
JOIN Student AS St ON S.Sno = St.Sno
WHERE St.Sdept = 'CS'
ORDER BY C.Cname DESC;
```
11. 检索“数据库”课程成绩高于90分的所有学生的学号、姓名和分数:
```
SELECT S.Sno, S.Sname, SC.Grade
FROM Student AS S
JOIN SC ON S.Sno = SC.Sno
JOIN Course AS C ON SC.Cno = C.Cno
WHERE C.Cname = '数据库' AND SC.Grade > 90;
```
12. 查询男生和女生选修课程的平均成绩:
```
SELECT S.Ssex, AVG(SC.Grade) AS AvgGrade
FROM Student AS S
JOIN SC ON S.Sno = SC.Sno
GROUP BY S.Ssex;
```
13. 检索没有选课的学生的学号和姓名:
```
SELECT S.Sno, S.Sname
FROM Student AS S
WHERE S.Sno NOT IN (SELECT Sno FROM SC);
```
14. 检索没有任何一门课程成绩不及格的学生的信息,包括学号、姓名:
```
SELECT S.Sno, S.Sname
FROM Student AS S
WHERE S.Sno NOT IN (SELECT Sno FROM SC WHERE Grade < 60);
```
.基于 jxgl数据库,使用SQL语句表达以下查询 ①检索年龄大于23岁的男学生的学号和姓名; ②检索至少选修一门课程的女学生姓名; ③检索王林不学的课程的课程号; ④检索至少选修两门课程的学生学号;
在JXGL数据库中,使用SQL语句可以按照以下方式编写:
1. 查询年龄大于23岁的男学生的学号和姓名:
```sql
SELECT student_id, name
FROM students
WHERE gender = '男' AND age > 23;
```
2. 查询至少选修一门课程的女学生姓名:
```sql
SELECT DISTINCT name
FROM students s
JOIN student_courses sc ON s.student_id = sc.student_id
WHERE s.gender = '女';
```
这里假设有一个student_courses表连接了学生和他们选修的课程。
3. 检索王林不学的课程的课程号:
```sql
SELECT course_code
FROM courses
WHERE course_code NOT IN (
SELECT course_code
FROM student_courses
WHERE student_id = (SELECT id FROM students WHERE name = '王林')
);
```
这里的假设是每个课程都有一个唯一的course_code,并且有student_courses表记录学生选课信息。
4. 检索至少选修两门课程的学生学号:
```sql
SELECT student_id
FROM (
SELECT student_id, COUNT(*) AS course_count
FROM student_courses
GROUP BY student_id
) subquery
WHERE course_count >= 2;
```
这个查询首先计算每个学生选修的课程数,然后选择那些课程数大于等于2的学生的学号。
阅读全文