MASTER OF COMPUTER APPLICATIONS
Course Code : MCS-023
Course Title : Introduction to Database Management Systems
Assignment Number : MCA(II)/023/Assignment/15-16
Maximum Marks : 100
Weightage : 25%
1. Construct an ER diagram for an Event Management System. Clearly indicate the entities, relationships, cardinality and the key constraints. Also, derive the unnormalized relational database tables with the help of this diagram.
ER Diagram
Notations for the components of ERD:
Entities: An entity is something about which the business needs to store data. An entity is a class of persons, places, objects, events or concepts about which we need to capture and store data. An entity instance is a single occurrence of an
entity.
Attribute: An attribute is a descriptive property or characteristic of an entity. Synonyms include element, property and field.A compound attribute is one that actually consists of other attributes. It is also known as a composite attribute. An attribute “Address” is the example of compound attribute as shown in the following illustration
Relationships: A relationship is a natural business association that exists between one or more entities. The relationship may represent an event that links the entities.
Cardinality: defines the minimum and maximum number of occurrences of one entity that may be related to a single occurrence of the other entity. Because all relationships are bidirectional, cardinality must be defined in both directions for every relationship.
Draw ERD for Online Examination System. Make necessary assumptions.
Figure:- ERD
2. Normalize the tables designed in Q1 till its requirements are satisfied.
Figure:- Normalized Table Diagram
