Entity Relationship Diagram. How does the IS A relationship translate into tables?

Question

I was simply wondering, how an ISA relationship in an ER diagram would transl

Answer 1

there are 4 options you can use to map this into an ER,

option 1

• Person(SIN,Name)
• Student(SIN,GPA)
• Teacher(SIN,Salary)

option 2 Since this is a covering relationship, option 2 is not a good match.

• Student(SIN,Name,GPA)
• Teacher(SIN,Name,Salary)

option 3

• Person(SIN,Name,GPA,Salary,Person_Type) person type can be student/teacher

option 4

• Person(SIN,Name,GPA,Salary,Student,Teacher) Student and Teacher are bool type fields, it can be yes or no,a good option for overlapping

Since the sub classes don't have much attributes, option 3 and option 4 are better to map this into an ER