How to use $in in mongodb query?

@jasen_gottlieb 

In MongoDB, the $in operator is used to match a field against multiple values. It allows you to specify an array of possible values, and the query will return documents where the field matches any of the values in the array.

Here's an example of how to use the $in operator in a MongoDB query:

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db.collection.find( { field: { $in: [<value1>, <value2>, ... ] } } )

For example, suppose you have a collection of documents that represent products, and each document has a category field that indicates the product's category. You can use the $in operator to find all products in the "clothing" or "electronics" categories:

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db.products.find( { category: { $in: [ "clothing", "electronics" ] } } )

This would return all documents in the products collection where the category field is either "clothing" or "electronics".

You can also use the $in operator with other query operators, such as $and or $or, to specify multiple criteria for your query. For example:

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db.products.find( { $and: [ { category: { $in: [ "clothing", "electronics" ] } }, { price: { $gte: 50 } } ] } )

This query would return all documents in the products collection where the category field is either "clothing" or "electronics", and the price field is greater than or equal to 50.

I hope this helps! Let me know if you have any other questions.