Ads
related to: er entity relationship diagram erd- Start Diagramming
Free 7-day trial with unlimited
documents and premium features.
- Hundreds of Templates
Make professional diagrams with
our extensive template library.
- Pricing
Get Lucidchart starting
at $7.95/month.
- Visio Import
Import and edit Visio files
online with Lucidchart.
- Visio Alternative
Lucidchart Is Significantly
Easy-To-Use Than Visio. Know More.
- Lucidchart for Teams
Manage licenses, security and
documents with a team account.
- Start Diagramming
Search results
Results From The WOW.Com Content Network
Diagrams created to represent attributes as well as entities and relationships may be called entity-attribute-relationship diagrams, rather than entity–relationship models. An ER model is typically implemented as a database. In a simple relational database implementation, each row of a table represents one instance of an entity type, and each ...
The enhanced entity–relationship (EER) model (or extended entity–relationship model) in computer science is a high-level or conceptual data model incorporating extensions to the original entity–relationship (ER) model, used in the design of databases.
A sample entity–relationship diagram. One of the most common types of conceptual schemas is the ER (entity–relationship model) diagrams. Attributes in ER diagrams are usually modeled as an oval with the name of the attribute, linked to the entity or relationship that contains the attribute.
Each instance of the category entity is simultaneously an instance of the generic entity. Non-specific relationships A relationship in which an instance of either entity can be related to any number of instances of the other. View levels Three levels of view are defined in IDEF1X: entity relationship (ER), key-based (KB), and fully attributed (FA).
Data structure diagrams are an extension of the entity–relationship model (ER model). In DSDs, attributes are specified inside the entity boxes rather than outside of them, while relationships are drawn as boxes composed of attributes which specify the constraints that bind entities together. DSDs differ from the ER model in that the ER model ...
An associative entity is a term used in relational and entity–relationship theory. A relational database requires the implementation of a base relation (or base table) to resolve many-to-many relationships. A base relation representing this kind of entity is called, informally, an associative table. An associative entity (using Chen notation)
Ad
related to: er entity relationship diagram erd