<h1 id="entity-relationship-diagram">Entity Relationship Diagram<a aria-hidden="true" class="anchor-heading icon-link" href="#entity-relationship-diagram"></a></h1>
<h2 id="highlights">Highlights<a aria-hidden="true" class="anchor-heading icon-link" href="#highlights"></a></h2>
<ul>
<li>"Strong vs. Weak entities and relationships: Entities can either exist on their own or they can only exist when associated with some other entity type."</li>
</ul>
<h2 id="issues">Issues<a aria-hidden="true" class="anchor-heading icon-link" href="#issues"></a></h2>
<ul>
<li><a href="https://dba.stackexchange.com/questions/197343/entity-relationship-diagrams-identifying-which-way-a-relationship-flows">https://dba.stackexchange.com/questions/197343/entity-relationship-diagrams-identifying-which-way-a-relationship-flows</a>  
<ul>
<li>(ERD diagrams suck)
<ul>
<li>also <a href="https://stackoverflow.com/questions/15941149/how-we-identify-the-relation-direction-in-an-er-diagram-if-we-use-chens-notation">https://stackoverflow.com/questions/15941149/how-we-identify-the-relation-direction-in-an-er-diagram-if-we-use-chens-notation</a></li>
</ul>
</li>
<li>but then, <a href="https://holowczak.com/drawing-entity-relationship-diagrams-with-uml-notation-using-lucidchart/?doing_wp_cron=1684965923.8165609836578369140625">https://holowczak.com/drawing-entity-relationship-diagrams-with-uml-notation-using-lucidchart/?doing_wp_cron=1684965923.8165609836578369140625</a></li>
</ul>
</li>
</ul>
<h2 id="resources">Resources<a aria-hidden="true" class="anchor-heading icon-link" href="#resources"></a></h2>
<ul>
<li><a href="https://stackoverflow.com/questions/38034049/is-optionality-mandatory-optional-and-participation-total-partial-are-same/38035173#38035173">https://stackoverflow.com/questions/38034049/is-optionality-mandatory-optional-and-participation-total-partial-are-same/38035173#38035173</a></li>
<li><a href="https://www.conceptdraw.com/examples/double-line-in-er-diagram-represents">https://www.conceptdraw.com/examples/double-line-in-er-diagram-represents</a></li>
</ul>
<hr>
<strong>Backlinks</strong>
<ul>
<li><a href="/wiki/notes/appi20z9mr8h9pcwdx8fad5">Structurizr Vs D2 vs Ilograph</a></li>
<li><a href="/wiki/notes/10cibfw52au9x66veslsrfh">Changing Perspective Embracing Temporal Modeling to Capture the Passage of Time </a></li>
</ul>

Entity Relationship Diagram

public-notes


Welcome! And beware!  

## Purpose

This vault is the "[[learning-in-public|ar.swyx.learn-in-public]]" part of my Second Brain. If you share some of my interests, please [reach out](https://djradon.github.io)! 

## Contents

- [[t]] my personal wikipedia
- [[idea]] (not necessarily mine)
- Resource Notes, including highlights, thoughts and metadata, for various things:
  - [[ar]] mostly articles, papers and web pages
  - [[book]]
  - [[community]]
  - [[course]]
  - [[event]]
  - [[game]]
  - [[loc]]
  - [[org]]
  - [[user]] 
  - [[prdct]] mostly software products, but also ontologies
  - [[recipe]]
  - [[video]] movies, tv episodes, youtube, etc
- [[vs]]
- [[wanted]]
- Some "Metadata Notes":
  - [[tags]] which may refer to any and multiple (or none) of the above
  - [[c]]: ways to categorize resources
  - [[p]]: ways to assert things about resources (mostly abandoned)

In terms of the [[t.km.zettelkasten]] method, this wiki is a commingling of literature notes with something @Sönke-Ahrens warned about: a "personal Wikipedia or a database" [^1]. 

In terms of [[t.tm.getting-things-done]], it's references, someday-maybe, next actions, and public projects.

## Beware!

This is a cluttered cupboard of jumbled jottings riddled with inaccuracies, confusion, and mistakes.

## What This Is Not

- evergreen-notes/digital-garden: for "synthesized" / original-ish publishable big-idea notes that should evolve over time, props to @andy-matuschak and @maggie-appleton
- blog: for "point-in-time" items to be shared: personal news, articles, etc.
  - e.g., [[ar.substack.carpe-noctem]]


[^1]: [[book.how-to-take-smart-notes]]  