19 lines
1.1 KiB
Markdown
19 lines
1.1 KiB
Markdown
---
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categories:
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- Databases
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tags: [mongo_db]
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---
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# MongoDB: Introduction
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MongoDB is not a relational database system like SQL, instead it is document-based which means you do not neeed to design database tables and schema, you are simply storing data as JSON and there is no transformation of the data.
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Most of the notes on Mongo will introduce it within the context of Node.js backend. We will be sending Javascript objects and arrays to Mongo and returning them as JSON.
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## Databases, collections, documents
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Although Mongo is not a relational database it has a structure that we can understand in relation to that paradigm. A **database** is obviously the overall structure. It comprises **collections** which are organised sets of data that are analagous to [tables](/Databases/Relational_database_architecture.md#table) in RDBs. Within each collection are a series of **documents** which we can think of as being equivalent to [rows](/Databases/Relational_database_architecture.md) in RDB table: units that comprise the collection.
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A document is a container comprising key-value pairs in the manner of an object.
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