首页Unknown column 'student.cno' in 'where clause'

Unknown column 'student.cno' in 'where clause'

时间: 2024-01-29 13:02:35 浏览: 181

用于 CNO 实验的 MATLAB 脚本.zip

1.版本：matlab2014/2019a/2021a 2.附赠案例数据可直接运行matlab程序。 3.代码特点：参数化编程、参数可方便更改、代码编程思路清晰、注释明细。 4.适用对象：计算机，电子信息工程、数学等专业的大学生课程设计、期末大作业和毕业设计。

"Unknown column 'student.cno' in 'where clause'"是一个MySQL错误，它表示在查询中使用了一个不存在的列名。在这个引用中，可能是因为在查询中使用了"student.cno"这个列名，但是在数据库中并不存在这个列名。需要检查查询语句和数据库中的表结构是否匹配。

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Unknown column 'student.cno' in 'where clause'

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解释一下select Sname from student where not exists( select * from course where course.Cno in (1,2) and not exists( SELECT * from sc where Sno=student.Sno AND Cno=course.Cno ) )

delete from sc from sc join student on sc.sno=student.sno from sc join course on sc.cno=course.cno where student.sdept ='计算机系'and grade <60 and cnamne='java'对不对

CREATE PROCEDURE s_grade @sno char(20) AS BEGIN SELECT student.sno, student.sname, course.cname, sc.grade FROM student INNER JOIN sc ON student.sno = sc.sno INNER JOIN course ON sc.cno = course.cno END

数据库mysql视图建立中Column 'cno' in where clause is ambiguous where子句中列'cno'有歧义

CREATE VIEW V_SCG AS SELECT Sno,Sname,Cname,Score,Credit from student,grade,course WHERE grade.Sno = student.Sno AND grade.Cno = course.Cno AND Cno = '0001'; 哪里错了

UPDATE SC SET Grade=Grade+1 WHERE Cno IN( SELECT Course.Cno FROM Course,SC WHERE SC.Cno = Course.Cno and Cname = '数据库' ); 实现为什么不对呢

修改这段代码：UPDATE grade SET Grades = Grades + 1; WHERE Cno IN (SELECT grade.Cno FROM grade,course WHERE course.Cteacher = '付大鹏'AND grade.Cno = course.Cno);

select sname from student where not exists (select * from course where not exists (select * from sc where sno=student.sno and Cno=course.cno));

SELECT Sname,Sno from student WHERE Sno IN (SELECT Sno,COUNT(sc.Cno),SUM(sc.Grade) from sc WHERE sc.Sno=student.Sno )运行报错，帮我纠错

41 使用jxgl数据库，查询没有被选修过的课程的课程号和课程名。 select cno,cname from Course join sc on Course.cno=sc.cno where Course.cno = Null;

解释一下SELECT s.Sno AS 学号, s.Sname AS 姓名 FROM Student s INNER JOIN SC ON s.Sno = SC.Sno WHERE SC.Cno NOT IN ( SELECT SC.Cno AS 课程号 FROM SC, Student s WHERE SC.Sno = s.Sno AND s.Sname = '刘晨' );

create view V_StudAvgScore1 as select student.sno StudNo,sname StudName, avg(grade) AvgScore,sum(grade) SumScore,max(grade) MaxScore,min(grade) MinScore,count(sc.cno ) CountCourse from student inner join sc on student.sno=sc.sno group by sc.sno,student.sname,student.sno;

USE teaching SELECT A.sno, sname, C.cno, cname, score FROM student A ,sc B , course C where B.cno=C.cno and A.sno=B.sno AND score>=90 该程序的功能是：

阅读代码，用文字解释功能 （4分） CREATE PROCEDURE MAX AS SELECT COMPANY.Cno, Cname FROM COMPANY, WORKS WHERE COMPANY.Cno=WORKS.Cno GROUP BY COMPANY.Cno, Cname HAVING COUNT()＞=ALL(SELECT COUNT() FROM WORKS GROUP BY Cno );

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阅读代码，用文字解释功能（4分） CREATE PROCEDURE MAX AS SELECT COMPANY.Cno, Cname FROM COMPANY, WORKS WHERE COMPANY.Cno=WORKS.Cno GROUP BY COMPANY.Cno, Cname HAVING COUNT()＞=ALL(SELECT COUNT() FROM WORKS GROUP BY Cno );