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

The file based system in dbms, The File Based System File based systems...

The File Based System File based systems are an early attempt to computerise the manual filing system. For example, a manual file can be set up to hold all the correspondence r

Normalization database, I need some help with my normalization database hom...

I need some help with my normalization database homework.

Convert erd to rdm model, Regional Gardens has many nurseries, including Wa...

Regional Gardens has many nurseries, including Wagga Wagga, Bathurst, Albury, Orange, and Dubbo. Each nursery is known by its campus code, eg WW, B, A, O and D respectively. Additi

Give concurrent sub states diagram for the classroom, Give Concurrent sub s...

Give Concurrent sub states diagram for the classroom and exam held. In Figure, simultaneous substrates have been taken. After passing Minor 1 test you could give Minor 2 test. T

Relationship cardinality, Cardinality shows the number of instances of an e...

Cardinality shows the number of instances of an entity associated with another entity participating in a relationship. Depend on the cardinality binary relationship can be further

For known, What are the function of DBA?

What are the function of DBA?

What is a query tree, What is a query tree? Ans: A query tree, as ...

What is a query tree? Ans: A query tree, as well known as operator graph, is a tree data structure that corresponds to a relational algebra expression. It denotes the inpu

Define the terms - physical schema and logical schema, Define the terms 1)...

Define the terms 1) physical schema 2) logical schema. Physical schema: The physical schema explains the database design at the physical level, which is the lowest lev

Complete replication-data replication, Complete replication: It implies ma...

Complete replication: It implies maintaining of a whole copy of the database at every site. Thus, the reliability & availability and performance for query response are maximized.

What is an index, What is an Index? An index is a small table having on...

What is an Index? An index is a small table having only two columns. The first column has a copy of the primary or candidate key of a table and the second column having a set o

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages