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Entity–relationship model

An entity–relationship model (or ER model) describes interrelated things of interest in a specific domain of knowledge. A basic ER model is composed of entity types (which classify the things of interest) and specifies relationships that can exist between entities (instances of those entity types).

Products, Components & Related diagramming convention techniques

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Overview

Introduction

Components

Related diagramming convention techniques

Model usability issues

In semantic modeling

Limitations

Advanced semantic analysis

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Map overview Semantic statistics

Entity–relationship model

Nodes87
Edges86
Triples52
Avg. degree1.98
Density0.022989
Components1

How this topic connects Entity context

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Entity–relationship model

Top relations

related to Limitations · 23
Entity–relationship model → An ER, Anchor Modeling, Badia, Brodie, Codd, Date, EER, ER, For, Fortune, In, Lemire, Liu, Many, OLAP, OO, Others, Similarly, Some, Some ER
see also · 15
Entity–relationship model → Approach, Associative, Comparison, Data Model, Designing, Diagram, Entity-Relationship, Extended, Frame, Open, Programming, Specification, Term, Type, Visual
related to Introduction · 5
Entity–relationship model → An ER, Diagrams, Entities, It, Typically

Important terminology Word statistics

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Important terminology

entity relationship model relationships database er entities data used modeling one design also diagrams notation attributes represent models may relational

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
database tablesinstance ofThe physical model is normally instantiated in the structural metadata of a database management system as relational database objects0.80text
database indexes such as unique key indexesinstance ofThe physical model is normally instantiated in the structural metadata of a database management system as relational database objects0.80text
and database constraints such as a foreign key constraint or a commonality constraintinstance ofThe physical model is normally instantiated in the structural metadata of a database management system as relational database objects0.80text
a house or a carinstance ofAn entity may be a physical object0.80text
is the owner ofinstance ofrelationships and roles as verbs or phrases.Role namingIt has also become prevalent to name roles with phrases0.80text
is owned byinstance ofrelationships and roles as verbs or phrases.Role namingIt has also become prevalent to name roles with phrases0.80text
used in the UML does not effectively represent the semantics of participation constraints imposed on relationships where the degree is higher than binaryinstance ofA 'look across' notation0.80text
is the owner ofinstance ofRole namingIt has also become prevalent to name roles with phrases0.80text
is owned byinstance ofRole namingIt has also become prevalent to name roles with phrases0.80text
Entity–relationship modelrelated to IntroductionAn ER0.60section
Entity–relationship modelrelated to IntroductionTypically0.60section
Entity–relationship modelrelated to IntroductionIt0.60section

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