sql - 从 SQL 转换为关系代数

Question

嘿，我被问到这个问题：

将以下 SQL 翻译成关系代数

SELECT DISTINCT Student.Name, Course.Name
FROM Student, 
     Attendee, 
     Course
WHERE 
        Student.Name = Attendee.Name 
   AND Attendee.CourseId = Course.CourseId 
   AND StudyCourse = ‘CS’ 
   AND Course.CourseId > 42 
   AND Year = 2011

我试图环顾四周，但我似乎无法找到如何做到这一点的具体答案。

Answer 1