我想根据与计算机或信息学等相关的毕业生来显示员工数据。拥有计算机学位（本科，硕士或博士学位）的员工将被视为一次或从未被计算过。每个员工都在一个部门工作。这是我的餐桌关系
Dept with structure (Dept_id, Dept_name)
------
A
B
C
D
Employee with structure (Emp_Id, Emp_name, Educational_history_id, Dept_id)
----------
Donny
Sarah
Tony
Dan
Education_level with structure (Education_level_id, Education_level_name)
---------------
Undergraduate
Master
Doctoral
Educational with structure (Educational_Id, Educational_Name)
-----------
Informatics
Computer Engineering
Economy
Math
Biology
Educational_History with structure (Educational_history_id, Emp_id, Educational_Id, Education_level_id)
----------------------
1. Donny have Undergraduate in Informatics, he in Dept A
2. Sarah have Undergraduate in Math but Master in Computer Engineering, she in Dept B
3. Tony have Doctoral in Informatic, he in Dept C
4. Dan have Undergraduate in Economy, he in Dept D
我需要的结果，向员工显示有关“信息学”的历史记录：
-------------------------------------------------
Emp_name | Dept | Educational | Education Level
------------------------------------------------
Donny | A | Informatics | Undergraduate
------------------------------------------------
Sarah | B | Computer Engineering | Master
------------------------------------------------
Tony | C | Informatics | Doctoral
如何显示结果？谢谢