Entity relationship model, Database Management System

Assignment Help:

Let us first look into some of the important features of ER model.

Entity relationship model is a high-level conceptual data model.
It permits us to define the data involved in a real-world enterprise in terms of objects and their relationships.
It is widely used to develop a first design of a database.
It gives a set of useful concepts that make it convenient for a developer to move from a basic set of information to a detailed and defined description of information that can be easily executed in a database system.
It defines data as a collection of relationships, entities and attributes.

Related Discussions:- Entity relationship model

Operator precedence-data manipulation language, Operator Precedence The...

Operator Precedence The basic operators used in SQL are * / - + Operators of the similar priority are evaluated From Left to right Parentheses are used to force priorit

Entity relaionship, multiplicity constarin

multiplicity constarin

What is magnetic disks, What is magnetic disks?explain it? Magnetic dis...

What is magnetic disks?explain it? Magnetic disk provides the bulk of secondary storage of modern computer system. The disk capacity is growing at over 50% per year. But the st

Keys, it can be possible to create any table without primary key

it can be possible to create any table without primary key

Prove that a relation which is 4nf must be bcnf, Prove that a relation whic...

Prove that a relation which is 4NF must be BCNF. Ans Let R be in 4NF. Suppose it is not in BCNF. Hence, there exists an FD X→Y in R such that x is not a super key. Although

Non-query optimisations, Part: Recommended (Non-query) Optimisations Thi...

Part: Recommended (Non-query) Optimisations This section entitled "Recommended (non-query) optimisations" should be a brief report containing recommended optimisations you would

Express types of information available in mysql, Express types of informati...

Express types of information available in MySQL? Information as regards the result of queries: This includes number of records affected by any SELECT or UPDATE or DELETE st

Transaction, what are the states of transaction?

what are the states of transaction?

Derived horizontal fragmentation, atient(PNumber, Name, NHS_no, Amount_due,...

atient(PNumber, Name, NHS_no, Amount_due, DNO, Doctor, Medical_Treatment), relation of schema Staff(StaffNum, Name, DNO, Task) and relation of schema Dept(DNO, Name, Location, Dire

What are the objectives of advance object design, What are the Objectives o...

What are the Objectives of Advance object design After this unit, you shall be able to: combine three OOAD models to obtain operations on the classes; develop algo

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages