33 lines
No EOL
1.8 KiB
Markdown
33 lines
No EOL
1.8 KiB
Markdown
Theory
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https://www.youtube.com/playlist?list=PL4cUxeGkcC9h77dJ-QJlwGlZlTd4ecZOA
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- relational database
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1 author can have many books whose information are stored in the other table named Books.
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So we have rows,columns, table and joining
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Columns is property
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and we use sql queries to use them
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- non relational database
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Here instead of rows, columns and tables we use collections and documents
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Each collection store a specific type of data record like users, authors and books.These records inside collections are called documents
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So users is collection unlike table in sql. and instead of containing columns and rows it contains document which is more like js object
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Here author field has nested object. in sql we would have to use other table for that.
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**Installation**
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- In arch use
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`yay -S mongodb-bin` this will install mongodb server and mongodb shell. Make sure to start mongodb service too by
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`systemctl start mongodb`
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also install mongodb-tools. `mongodb-org-tools` in case of debian and `mongodb-tools-bin` from aur in case of arch. it is for import, export and other diagonistic tools
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- in linux mint/ubuntu
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https://www.mongodb.com/docs/v7.0/tutorial/install-mongodb-on-ubuntu/#std-label-install-mdb-community-ubuntu
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**Collections and Documents**
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Mongodb stores data in BSON which is Binary JSON and returns result in JSON.
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Each document has a property `_id` which is assigned automatically by mongodb and its data type is 'ObjectId'.
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