.. This file is part of the OpenDSA eTextbook project. See
.. http://opendsa.org for more details.
.. Copyright (c) 2012-2020 by the OpenDSA Project Contributors, and
.. distributed under an MIT open source license.

.. avmetadata::
   :author: Noha
   :satisfies: ERD
   :topic: ERD


Entity-Relationship diagram and its notation
============================================

ER Diagram Notations
--------------------

ER Diagram Components
---------------------
Entity types, entity set
~~~~~~~~~~~~~~~~~~~~~~~~
ssssssssssssssssssssssssss
satisfiess
satisfiess
Hello world Hello






Attributes, keys
~~~~~~~~~~~~~~~~

Relationship types and structure
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


Weak Vs. Strong entity
~~~~~~~~~~~~~~~~~~~~~~
Naming convention and design issues
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


.. inlineav:: manyToMany ss
   :long_name: ManytomanyRelationship Slideshow
   :links: AV/Database/manyToMany.css
   :scripts: AV/Database/manyToMany.js
   :output: show


.. inlineav:: oneToOneUnaryRelation ss
   :long_name: oneToOneUnaryRelationship Slideshow
   :links: AV/Database/oneToOneUnaryRelation.css
   :scripts: AV/Database/oneToOneUnaryRelation.js
   :output: show

.. inlineav:: oneToManyUnaryRelation ss
   :long_name: oneToManyUnaryRelationship Slideshow
   :links: AV/Database/oneToManyUnaryRelation.css
   :scripts: AV/Database/oneToManyUnaryRelation.js
   :output: show



.. inlineav:: ManyToManyUnaryRelation ss
   :long_name: ManyToManyUnaryRelationship Slideshow
   :links: AV/Database/ManyToManyUnaryRelation.css
   :scripts: AV/Database/ManyToManyUnaryRelation.js
   :output: show