$in
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What is $in?
The $in operator in MongoDB selects documents where a field value matches any value in a specified array. It provides efficient multiple value matching without using multiple $or conditions. $in supports all BSON data types and is particularly useful for filtering by lists of IDs, categories, or enumerated values, offering better performance than equivalent $or queries.
Free resources to learn $in
- Official docsAggregation Operators
- Official docs$in
More in stage 5: Creating Indexes
$in: common questions
Can I learn $in in Hindi?
This lesson is written in English. Once you sign in, open it in the interactive course and ask the AI tutor to explain $in in Hindi or Hinglish. The tutor answers from this lesson’s own text, so it stays on the syllabus, and it runs on your own Google, OpenAI or Anthropic key.
Is this $in tutorial for beginners?
It is lesson 46 of 106 in the free MongoDB roadmap, in stage 5, Creating Indexes. If you are new to MongoDB, start from stage 1 and come back here in order; if you already know the earlier stages, this lesson stands on its own.