Relational schema, Database Management System

Assignment Help:

crete a data base relationship model

Entity:

  1. Students;
  2. Professors;
  3. Dormitories buildings;

Attributes of students:

  1. Name;
  2. Address;
  3. Dorm;
  4. Room number;
  5. Stu dent advisors;

Relationship ratios:

  1. One to One- student to advisor;
  2. One to Many (1: N)-advisor to students;
  3. Many to Many (n: M)- students to their advisors;

Foreign keys

This is the referencing relation of the column i.e. student advisor

Primary keys

They identify the column i.e. the Sname.

Assumptions

  1. Only single attributes are mentioned for the database because the database is made by single attributes
  2. Concepts represented by entity, relationship or attributes type  are represented by capital letters
  3. Key property (k) types which is a attribute of property (p) can be determined by P and vice versa
  4. Verticals line separate the  main attributes of the relation
  5. Each attributes is an atomic; a distinct line attributes
  6. Each of the tuples carry single phone numbers of both students and advisors

Related Discussions:- Relational schema

Create a database for their customers, The ABC Bank authority now wants to ...

The ABC Bank authority now wants to create a database for their customers. So you are requested to modify your program of Assignment A3 as follows. The main program first displa

What do you mean by an execution plan, What do you mean by an execution pla...

What do you mean by an execution plan? Why is it used? How will you view it? a.) An execution plan can be known as a road map which textually or graphically illustrates the dat

Normalization e, explain normalization,and give the examples 1NF,2NF,3NF,BC...

explain normalization,and give the examples 1NF,2NF,3NF,BCNF.AND FUNCTIONAL DEPANDENACY AND DECOMPOSITION TECHNIQUES.

In case of entity integrity the primary key may be declared, In case of ent...

In case of entity integrity, the primary key may be declared? In a case of entity integrity primary key may be not Null.

Introduction to Database Design and Development, Every School has many teac...

Every School has many teachers and many students. Each student is assigned to one school and each teacher works for one school only. Each teacher teaches more than one subject but

Develop a fragment of a hypothetical system, The objectives of this assignm...

The objectives of this assignment are:  - to develop skills in the design of database driven applications  - to develop skills in applying SQL to implement the relational and

Lock, lock and types of lock

lock and types of lock

The need for three level architecture, The need for three level architectur...

The need for three level architecture The aim of the three level architecture is to divide each user's view of the database from the way the database is physically shown.

Define atom of domain relational calculus, Define Atom of domain relational...

Define Atom of domain relational calculus An atom has the outline 1 , x 2 , ... , x n > -> r , in which r stands for a relation on n attributes and x 1 , x 2 , ... , x n ar

What are the advantages of dbms, What are the advantages of DBMS ? 1. ...

What are the advantages of DBMS ? 1. Centralized Management and Control - One of the major advantages of using a database system is in which the organization could exert, thr

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd