列名不明确

Question

我不知道这可能是什么问题：

请帮我 ：/

SELECT 
   Name, CourseID,  CourseName,  MeetingDays, MeetingTime, ProfID 
FROM  
   Course,  CourseSection,  Student
WHERE 
   Course.CourseID = CourseSection.CourseID
ORDER BY 
   Name, CourseName

Answer 1

列名CourseID存在于两个表中。 因此，要正确使用，请使用<tablename>.CourseID ：

SELECT Name, Course.CourseID,  CourseName,  MeetingDays, MeetingTime, ProfID 

FROM  Course,  CourseSection,  Student

WHERE Course.CourseID = CourseSection.CourseID

ORDER BY Name, CourseName