MongoDB Query Operators

MongoDB Query Operators

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