From Beginner to Pro: Querying Arrays in MongoDB
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🔴 Video summary
$size is an operator in MongoDB that returns the number of elements in an array.
$all is an operator that returns documents where the value of a field is an array that contains all the specified elements.
$in is an operator that returns documents where the value of a field is in the specified list.
$elemMatch is an operator that returns documents where the value of a field is an array that contains at least one element that matches the specified criteria.
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