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MongoDB Query Operators
The query operators enhance the functionality of MongoDB by allowing developers to create complex queries to interact with data sets that match their applications. There are many query operators that can be used to compare and reference document fields.
Comparison
The following operators can be used in queries to compare values:
$eq: Values are equal$ne: Values are not equal$gt: Value is greater than another value$gte: Value is greater than or equal to another value$lt: Value is less than another value$lte: Value is less than or equal to another value$in: Value is matched within an array
Logical
The following operators can logically compare multiple queries.
$and: Returns documents where both queries match$or: Returns documents where either query matches$nor: Returns documents where both queries fail to match$not: Returns documents where the query does not match
Evaluation
The following operators assist in evaluating documents.
$regex: Allows the use of regular expressions when evaluating field values$text: Performs a text search$where: Uses a JavaScript expression to match documents
What is MongoDB Query Operators ?
