Skip to content

Instantly share code, notes, and snippets.

@danilobatistaqueiroz

danilobatistaqueiroz/ders.md

Last active August 24, 2018 19:03
Show Gist options

  • Select an option

    Learn more about clone URLs
  • Save danilobatistaqueiroz/3a1741dd160a5a83dd602d7d860f300f to your computer and use it in GitHub Desktop.

Select an option

Learn more about clone URLs
Save danilobatistaqueiroz/3a1741dd160a5a83dd602d7d860f300f to your computer and use it in GitHub Desktop.
Download ZIP
DER's diagramas entidade relacionamento
Raw
ders.md

Diagrama Entidade Relacionamento (DER)

in English entity–relationship model (ER model)

Differences between physical, logical and conceptual models:
https://classroom.synonym.com/what-is-the-difference-between-a-conceptual-model-a-physical-model-12592752.html

http://tdan.com/conceptual-logical-physical-clearing-the-confusion/5021

An entity with an attribute
193px-erd-entity-with-attribute svg

A relationship with an attribute
erd-relationship-with-attribute

Primary key
erd-id-as-primary-key

Various methods of representing the same one to many relationship.
320px-erd_representation svg

Some ER's

1)Cadastro Nacional de Veiculos
1 1

  1. Biblioteca
    2

  2. Biblioteca
    biblioteca

  3. ER model's for an e-shop

diagrama entidade-relacionamento

diagrama entidade-relacionamento 1

c1 modelagem entidade-relacionamento

Links:

https://en.wikipedia.org/wiki/Entity%E2%80%93relationship_model

http://sistemassaoluis.blogspot.com.br/2009/08/der-diagrama-entidade-relacionamento.html

http://slideplayer.com.br/slide/389605/

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment