獲取數據庫到1NF或2NF - mysql

Question

如何獲得更好的1NF或2NF形式的這個MySQL數據庫？

我盡我所能，以刪除冗餘數據。看起來有多餘的數據仍在「Prof_Dept」中

Answer 1

模式看起來很奇怪。一個由Department_Dept的孩子（與其中的Professor_DeptID FK一起）的部門如何？這意味着沒有「科學能力」。你會被存儲

professor john's science department 
professor john's physics department 
professor tom's physics department 
etc 

我認爲表應

Professor 
Department 
    <bridge between the two> (Professor_Dept) 
Course 
    (this hangs off the bridge table, since the combination 
    defines the Course instructor [professor] and department) 

---

Professor: id, name, e.g. "John" 
Department: id, name, e.g. "COM" 
Professor_Dept: id, professor_id (FK), department_id (FK), modified_date 
Course: Professor_Dept_id (FK), number, course_modified 

從課程中，您已通過FK知道哪個教授和DEPT它涉及到。