E-Rdiagram.ppt
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This document provides an overview of entity-relationship (ER) modeling. It defines ER modeling as a high-level data model used to define the data elements and relationships for a specified system. The document then discusses key concepts in ER modeling including entities, attributes, different types of attributes (single-value/multi-value, simple/composite, base/derived, null value), and relationships between entities.
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(a) E-R Diagram:
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person
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- 2. ER model stands for an Entity-Relationship model. It is a high-level data model. This model is used to define the data elements and relationship for a specified system. It develops a conceptual design for the database. It also develops a very simple and easy to design view of data.
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- 4. INTRODUTION • The entity relationship model is based on the real word which consist of a set of objects. • The basic objects are called entities • The properties of the entities are known as attributes. • There must be a relationship between the two entities.
- 5. 2.ENTITY • An entity is an object or thing or a person which can be distinguished with the help of its attributes. • Entity is an important factor of any organization . • The organization can have any number of living and non-living objects. • These objects are known as entities. • Examples of entity are-student, college,
- 7. 3.ATTRIBUTES • Each entity of the entity set is identified by the properties or characteristics. • These properties of the entity set are known as attributes. • There may be a number of attributes in any entity. • Most of them may be at least one property which identifies the entities.
- 9. 4.TYPES OF ATTRIBUTES I. SINGLEVALUE AND MULTIVALUE II. SIMPLE AND COMPOSITE III.BASE AND DERIVE VALUE IV.NULL VALUE
- 10. SINGLEVALUE AND MULTIVALUE SINGLEVALUE :- • The attributes which can contain maximum one and minimum one value are known as single attribute. • Example:- roll no, enrollment no etc. MULTIVALUE:- • The attributes which can contain more than one value of a time are known as multi value attributes. • Multi values are represented by double ovals. • Example:- contact no.
- 11. SIMPLE AND COMPOSITE SIMPLE ATTRIBUTES:- • The attributes which cannot be divided are examples of simple attributes. • Example:-enrollment no, roll no etc. COMPOSITE ATTRIBUTES:- • The attributes which can be of further classified are known as composite attributes. • Example:-address of a student can be further divided into Q. no, street no, postal no etc.
- 12. BASE AND DERIVE VALUE BASE ATTRIBUTES:- • The attributes where value is a compulsion are known as base attributes . • Example:-DOB. DERIVED ATTRIBUTES:- • These are the attributes for which the value is calculated using base attributes of some operations • Derive values are represented by dotted oval. • Example:- Age can be calculated using the base value date of birth.
- 13. NULL VALUE • Normally every attribute takes values from the range of values but there may be cases where its not possible to insert values every time. • The situation is handled using special type value “NULL”.
- 14. STUDENT COLLEGE has Fig:- E-R MODLE OF STUDENT
- 15. THANKS