已知Stu表中有Sno,StuCose中有Sno和Cno,Cose中有Cno和Cname,将数据结构最低分同学的成绩修改为60分。用MySQL怎么写
时间: 2024-06-10 07:04:54 浏览: 49
你可以使用以下SQL语句来更新数据结构成绩最低分的学生的成绩为60分:
```
UPDATE StuCose
SET Score = 60
WHERE Sno = (
SELECT Sno
FROM (
SELECT Sno
FROM StuCose
ORDER BY Score
LIMIT 1
) AS lowest
) AND Cno = 'Data Structure';
```
这个SQL语句将在StuCose表中找到数据结构课程中成绩最低的学生,然后将他们的成绩更新为60分。注意,这个语句仅仅会修改成绩最低的学生的成绩,如果有多个学生的成绩最低,也仅仅会修改其中的一个。
相关问题
已知Stu表中有Sno,StuCose中有Sno和Cno,Cose中有Cno和Cname,将自动化系所有学生的数据结构成绩都加5分用MySQL怎么写
您可以使用下面的MySQL语句来将自动化系所有学生的数据结构成绩都加5分:
UPDATE StuCose
SET Cscore = Cscore + 5
WHERE Sno IN
(SELECT Sno FROM Stu WHERE Sdept = '自动化' AND Sno IN
(SELECT Sno FROM StuCose WHERE Cno =
(SELECT Cno FROM Cose WHERE Cname = '数据结构')));
这条语句将寻找所有学习“数据结构”课程的自动化系学生的成绩,然后将其加5分。请注意,这条语句假定您已经正确连接了所有表。
我现在有三张表,stu,course,sc,其中stu有sno,sname,sex,age,dept;course中有cno,cname;sc中有sno,cno,score,sc中sno和cno是外键,现在需要用sql语句查询选修了”c1”这门课的学生的学号、姓名、年龄和成绩,并根据年龄进行倒序排列
以下是用 SQL 语句查询选修了“c1”这门课的学生的学号、姓名、年龄和成绩,并根据年龄进行倒序排列的代码:
```
SELECT stu.sno, stu.sname, stu.age, sc.score
FROM stu, course, sc
WHERE stu.sno = sc.sno AND course.cno = sc.cno AND course.cname = 'c1'
ORDER BY stu.age DESC;
```
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