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@@ -11,6 +11,8 @@ meta: Relational databases serve the critical role of persisting data in many Py
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A database is an abstraction on top of an operating system's file system to
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ease creating, reading, updating, and deleting persistent data.
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<imgsrc="/img/logos/databases.jpg"width="100%"alt="PostgreSQL, SQLite and MySQL logos, copyright their respective owners."class="technical-diagram"style="border-radius:5px;border:1pxsolid#999" />
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## Why are databases necessary?
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At a high level web applications store data and present it to users in a
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