Query Operators

Comparison

$eq	Matches values that are equal to a specified value.
$ne	Matches all values that are not equal to a specified value.
$gt, $>	Matches values that are greater than a specified value.
$gte, $>=	Matches values that are greater than or equal to a specified value.
$lt, $<	Matches values that are less than a specified value.
$lte, $<=	Matches values that are less than or equal to a specified value.
$in	Matches any of the values specified in an array.
$nin	Matches none of the values specified in an array.

Logical

$and, $all	Joins query clauses with a logical AND returns all documents that match the conditions of both clauses.
$or, $any	Joins query clauses with a logical OR returns all documents that match the conditions of either clause.
$not	Inverts the effect of a query expression and returns documents that do not match the query expression.

Element

$exists	Matches documents that have the specified field.
$type, $is	Selects documents if a field is of the specified type.

Array

$size, $length	Selects documents if the array field is a specified size.
$elemMatch	Selects documents if any element in the array field matches the specified query.
$contains	Matches arrays that contain the specified element.
$notcontains	Matches arrays that don’t contain the specified element.

Evaluation

$regex	Selects documents where values match a specified regular expression.
$where, $func, $f	Matches documents that satisfy a Python filter function.