Relational Model2. Consider the relations Students, Faculty, Courses, Rooms, Enrolled, Teaches, andMeetsln defined below.• Students(sid: string, name: string, login: string, age: integer, gpa: real)• Faculty(fid: string, fname: string, sal: real)• Courses(cid: string, cname: string, credits: integer)• Rooms(rno: integer, address: string, capacity: integer)• Enrolled(sid: string, cid: string, grade: string)• Teaches(fid: string, cid: string)• MeetsIn(cid: string, rno: integer, time: string)a) List three foreign key (to primary key) constraints among these relations.b) Give three examples of tuple or domain constraints over these relations that arenot primary key or foreign key constraints. For each of your constraints in (a)and (b), describe in one sentence why your constraint is necessary.

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Answered: Consider the relations Students,…

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Consider the relations Students, Faculty, Courses, Rooms, Enrolled, Teaches, and MeetsIn defined below.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

Enhanced ER Model

The enhanced ER model is an abbreviation for Enhanced Entity-Relationship (EER) model. As you know, the entity-relationship (ER) model is a pictorial illustration of the relationship between various entities of a domain. In the case of a large amount of data with multiple interrelated entities, the ER diagrams become complex and tough to interpret. For such cases, the need for enhancement in the ER model was observed, and thus, the EER model was designed.

Question

Relational Model
2. Consider the relations Students, Faculty, Courses, Rooms, Enrolled, Teaches, and
Meetsln defined below.
• Students(sid: string, name: string, login: string, age: integer, gpa: real)
• Faculty(fid: string, fname: string, sal: real)
• Courses(cid: string, cname: string, credits: integer)
• Rooms(rno: integer, address: string, capacity: integer)
• Enrolled(sid: string, cid: string, grade: string)
• Teaches(fid: string, cid: string)
• MeetsIn(cid: string, rno: integer, time: string)
a) List three foreign key (to primary key) constraints among these relations.
b) Give three examples of tuple or domain constraints over these relations that are
not primary key or foreign key constraints. For each of your constraints in (a)
and (b), describe in one sentence why your constraint is necessary.

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