MongoDB Tutorial

What MongoDB is MongoDB is a document database. Instead of rows in fixed tables, it stores documents – flexible, JSON-like objects – grouped into collections . A document can hold ...

Getting MongoDB You have three easy options: MongoDB Community Server installed locally. Docker : docker run -d -p 27017:27017 --name mongo mongo:7 – running in seconds. MongoDB ...

Create Each insert returns the generated _id . If you do not supply _id , MongoDB creates an ObjectId for you. Read The first argument to find is the query filter – a document ...

Comparison operators Match on ranges and sets using operators prefixed with $ : $gt , $gte , $lt , $lte – greater/less than. $ne – not equal; $in / $nin – in / not in a list. ...

Why indexes Without an index, MongoDB scans every document in a collection to answer a query – fine for ten documents, disastrous for ten million. An index is a sorted data ...

Two ways to relate data Relational databases split everything into tables and join them. MongoDB gives you a choice for related data: Embed – nest the related data inside the ...