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entity-relationship diagram, ER-diagram, database ERD Entity-Relationship Diagram (ERD)

entity-relationship diagram, ER-diagram, database ERD
An Entity-Relationship Diagram (ERD) is a visual presentation of entities and relationships. That type of diagrams is often used in the semi-structured or unstructured data in databases and information systems. At first glance ERD is similar to a flowch
This ERD sample was redesigned from the Wikimedia Commons file: WordPress file-reference ERD.svg. [commons.wikimedia.org/ wiki/ File:WordPress_ file-reference_ ERD.svg]
"WordPress is a MySQL-backed blogging platform in which uploaded files are saved to a user-configurable uploads directory. Files in this directory can be organised into a number of different subdirectory structures (by default, named by year and month) under wp-content/ uploads/ in the installation directory. Files are accessed directly by the web server (and not read/ written via the application). Each uploaded file has a single row in the posts table (which may or may not be linked to an actual post row via the post_ parent key). The post_ type column of this row has a value of 'attachment'. Rows in the postmeta table are linked to this row. Where the meta_ key column of postmeta is '_ wp_ attached_ file', the meta_ value column is a filename, relative to the WP upload directory." [Web application file-reference methods. Wikiversity]
The ERD example "WordPress file-reference ERD" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Entity-Relationship Diagram (ERD) solution from the Software Development area of ConceptDraw Solution Park.
ERD
ERD, note, entity, attribute,
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MS Visio Look a Like Diagrams

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