design problem of dbms

7/31/2019 Design Problem of Dbms

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Design problem: 1

Database And Management System

Submitted to:

Submitted By:

Miss Jaspreet Kaur Shikha

KumariRoll No. 20

SECTION:

A1811


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Problem:

A database is to be designed for a University to monitor students' progress throughout their

course of study. The students are reading for a degree (such as B.Tech, B.Tech (Hons)

MCA, etc) within the framework of the modular system. The University provides a numberof courses, each being characterized by its code, title, credit value, course coordinator,

teaching staff and the department they come from. A course is co-ordinated by a course

coordinator who shares teaching duties with one or more lecturers. A lecturer may teachmore than one course. Students are free to choose any course they wish but the following

rules must be observed: some courses require pre-requisites courses and some degree

programs have compulsory courses. The database is also to contain some information about

students including their numbers, names, addresses, degrees they read for, and their pastperformance (i.e. courses taken and examination results).

Represent the complete scenario with the help of ER Diagram and design logical schemafor this database. Also specify desirable constraints and justify your design approach even

in a single small step.

Relation of entities

University offers degrees: one to many

Degrees has departments: many to many relation

Lecturer belongs to department: many to one relation

Department offers courses: one to many relation

Lecturer teach courses: many to many relation

Instructor plan courses: one to one relation

Instructor shares duties with lecturer: one to many relation

Student studies courses: many to many relation

Student acquire grades: many to one relation

Some courses has prerequisite: one to one relation

Identification of Entities and Relations in ER Diagram

university(university_id, university_name,degree)

courses (course_code, course_name, credit, hours, dept_id)

department ( dept_id, dept_name, HOD)


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lecturer (faculty_id, f_name, l_name, salary, phone_no, email, dept_id, inst_id)

instructor(inst_id,f_name,l_name,salary,phone_no,email, course_code)

students (reg_no, f_name, l_name, address, CGPA)

grades ( registration_no, letter_grade, course_code)

studies (course_code, reg_no)

teach (faculty_id, course_code)

prerequisites (course_code, prerequisites)

ER Diagram

(please see the attachment with this document for clear view of diagram)


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Entity Relationship Key


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Logical schema concentrates on describing entities, data types, relationships

and constraints.

university

Name Null? Type

UNIVERSITY_ID NOT NULL NUMBER(10)

UNIVERSITY_NAME NOT NULL VARCHAR2(20)

courses

Name Null? Type

COURSE_CODE NOT NULL VARCHAR2(20)

COURSE_NAME NOT NULL VARCHAR2(20)CREDIT NOT NULL NUMBER(10)

HOURS NOT NULL NUMBER(10)DEPT_ID NUMBER(10)

department

Name Null? Type

DEPT_ID NOT NULL NUMBER(10)DEPT_NAME NOT NULL VARCHAR2(20)

HOD VARCHAR2(10)

lecturer

Name Null? Type

FACULTY_ID NOT NULL NUMBER(10)F_NAME NOT NULL VARCHAR2(20)

L_NAME VARCHAR2(20)

SALARY NUMBER(10)

PHONE_NO NUMBER(10)

EMAIL VARCHAR2(30)

DEPT_ID NUMBER(10)

INST_ID NUMBER(10)

instructor

Name Null? Type


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INST_ID NOT NULL NUMBER(10)

F_NAME NOT NULL VARCHAR2(20)

L_NAME VARCHAR2(20)

SALARY NUMBER(10)

PHONE_NO NUMBER(10)

EMAIL NOT NULL VARCHAR2(20)COURSE_CODE VARCHAR2(20)

student

Name Null? Type

REG_NO NOT NULL NUMBER(10)

F_NAME NOT NULL VARCHAR2(20)

L_NAME VARCHAR2(20)

ADDRESS NOT NULL VARCHAR2(20)

CGPA NUMBER(10)

studies

Name Null? TypeCOURSE_CODE VARCHAR2(20)

REG_NO NUMBER(10)

teach

Name Null? Type

FACULTY_ID NUMBER(10)

COURSE_CODE VARCHAR2(20)has

Name Null? Type

COURSE_CODE VARCHAR2(20)

PREREQUISITES NOT NULL VARCHAR2(50)

Entities with desirable constraints

university( university_id ,

university_name )

courses (course_code ,

course_name ,

credit ,

hours ,

dept_id )


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department ( dept_id ,

dept_name ,

HOD)

lecturer (faculty_id ,

f_name ,

l_name,

salary,

phone_no,

email,

dept_id ,

inst_id )

instructor(inst_id ,

f_name ,

l_name,

salary,

phone_no,

email,

course_code id )

students (reg_no,

f_name,l_name,

address,

CGPA)

grades ( reg_no,

letter_grade,

course_code )

Relations with desirable constraints

studies (course_code ,

reg_no )

teach (faculty_id ,


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course_code )

has (course_code ,

prerequisites)

Creating tables

CREATE TABLE university( university_id VARCHAR(20) primary

key,

University_name VARCHAR(50) NOT NULL);

CREATE TABLE courses ( course_code VARCHAR(20) Primary

Key,

course_name VARCHAR(20) NOT NULL,

credit NUMBER(10) NOT NULL,

hours NUMBER(10) NOT NULL,

dept_id NUMBER(10) REFERENCES department(dept_id));

CREATE TABLE department( dept_id NUMBER(10) primary key,

dept_name VARCHAR(20) NOT NULL,

HOD VARCHAR(10));

CREATE TABLE instructor( inst_id NUMBER(10) primary key,

f_name VARCHAR(20) NOT NULL,

l_name VARCHAR(20),

salary NUMBER(10),

phone_no NUMBER(10),

email VARCHAR(20) NOT NULL,


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course_code VARCHAR(20) REFERENCES courses(course_code));

CREATE TABLE lecturer (faculty_id NUMBER(10) primary key,


l_name VARCHAR(20),

salary NUMBER(10),

phone_no NUMBER(10),

email VARCHAR(30),

dept_id NUMBER(10) REFERENCES department(dept_id),

inst_id NUMBER(10) REFERENCES instructor(inst_id));

CREATE TABLE students ( reg_no NUMBER(10) primary key,


l_name VARCHAR(20),

address VARCHAR(20) NOT NULL,

CGPA NUMBER(10));

CREATE TABLE grades (registration_no NUMBER(10),

letter_grade VARCHAR(2),

course_code VARCHAR(20));

CREATE TABLE studies (course_code VARCHAR(20)

REFERENCES courses(course_code),

reg_no NUMBER(10) REFERENCES students(reg_no));


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CREATE TABLE teach (faculty_id NUMBER(10) REFERENCES

lecturer(faculty_id),

course_code VARCHAR(20) REFERENCES courses(course_code));

CREATE TABLE has ( course_code VARCHAR(20)

REFERENCES courses(course_code),

prerequisites VARCHAR(50) NOT NULL);

Overview of tables createduniversityuniversity_id university_name

coursescourse_code course_name credit_value hours dept_id

departmentdept_id dept_name H.O.D

lecturer

faculty_id f_name l_name salary phone_no email dept_id

instructor

inst_id f_name l_name salary phone_no email cour

students

reg_no f_name l_name address grades


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teach

faculty_id course_code

studies

course_code reg_no

has

course_code Prerequisites

design problem of dbms

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