This ER (Entity Relationship) Diagram represents the model of Telephone Directory Management System Entity. The entity-relationship diagram of Telephone Directory Management System shows all the visual instrument of database tables and the relations between Contact Details, City Name, New Phone Number, Email Id etc. It used structure data and to define the relationships between structured data groups of Telephone Directory Management System functionalities. The main entities of the Telephone Directory Management System are New Phone Number, Contact Details, Address, City Name, List of Contact and Email Id.
Telephone Directory Management System entities and their attributes :
- New Phone Number Entity : Attributes of New Phone Number are phone_number_id, phone_number_contact_id, phone_number_name, phone_number_type, phone_number_description
- Contact Details Entity : Attributes of Contact Details are contact_id, contact_name, contact_phone_number, contact_type, contact_description
- Address Entity : Attributes of Address are address_id, address_people_id, address_place, address_type, address_description
- City Name Entity : Attributes of City Name are city_id, city_name, vtype, city_description
- List of Contact Entity : Attributes of List of Contact are list_contact_id, list_contact_name, vtype, vdescription
- Email Id Entity : Attributes of Email Id are email_id, email_title, email_type, email_description
Description of Telephone Directory Management System Database :
- The details of New Phone Number is store into the New Phone Number tables respective with all tables
- Each entity ( Email Id, Address, List of Contact, Contact Details, New Phone Number) contains primary key and unique keys.
- The entity Address, List of Contact has binded with New Phone Number, Contact Details entities with foreign key
- There is one-to-one and one-to-many relationships available between List of Contact, City Name, Email Id, New Phone Number
- All the entities New Phone Number, List of Contact, Address, Email Id are normalized and reduce duplicacy of records
- We have implemented indexing on each tables of Telephone Directory Management System tables for fast query execution.