Query and Projection Operators
Comparison Query operators
Name |
Description |
$gt |
Matches values that are greater than the value specified in the query. |
$lt |
Matches values that are less than the value specified in the query. |
$gte |
Matches values that are greater than or equal to the value specified in the query. |
$lte |
Matches values that are less than or equal to the value specified in the query. |
$ne |
Matches all values that are not equal to the value specified in the query. |
$in |
Matches any of the values that exist in an array specified in the query. |
$nin |
Matches values that do not exist in an array specified to the query. |
Logical Query operators
Name |
Description |
$and |
Joins query clauses with a logical AND returns all documents that match the conditions of both clauses. |
$not |
Inverts the effect of a query expression and returns documents that do not match the query expression. |
$or |
Joins query clauses with a logical OR returns all documents that match the conditions of either clause. |
$nor |
Joins query clauses with a logical NOR returns all documents that fail to match both clauses. |
Element Query operators
Name |
Description |
$exists |
Matches documents that have the specified field. |
$type |
Selects documents if a field is of the specified type. |
Evaluation Query operators
Name |
Description |
$mod |
Performs a modulo operation on the value of a field and selects documents with a specified result. |
$regex |
Selects documents where values match a specified regular expression. |
$where |
Matches documents that satisfy a JavaScript expression. |
Query operator Array
Name |
Description |
$all |
Matches arrays that contain all elements specified in the query. |
$elemMatch |
Selects documents if element in the array field matches all the specified $elemMatch conditions. |
$size |
Selects documents if the array field is a specified size. |
Projection operator
Name |
Description |
$ |
Projects the first element in an array that matches the query condition. |
$elemMatch(projection) |
Projects the first element in an array that matches the specified $elemMatch condition. |
$slice |
Limits the number of elements projected from an array. Supports skip and limit slices. |
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Source: http://www.w3resource.com/mongodb/mongodb-query-and-projection-operators.php