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The $query operator provides an interface to describe queries. Consider the following operation:

db.collection.find( { $query: { age : 25 } } )

This is equivalent to the following db.collection.find() method that may be more familiar to you:

db.collection.find( { age : 25 } )

These operations return only those documents in the collection named collection where the age field equals 25.


Do not mix query forms. If you use the $query format, do not append cursor methods to the find(). To modify the query use the meta-query operators, such as $explain.

Therefore, the following two operations are equivalent:

db.collection.find( { $query: { age : 25 }, $explain: true } )
db.collection.find( { age : 25 } ).explain()

See also

For more information about queries in MongoDB see Read, Read Operations, db.collection.find(), and Getting Started with MongoDB Development.

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