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Query an Array
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Match an Array
The following example queries for all documents where the field tags
value is an array with exactly two elements, "red" and "blank",
in the specified order:
If, instead, you wish to find an array that contains both the elements
"red" and "blank", without regard to order or other elements in
the array, use the $all operator:
Query an Array for an Element
The following example queries for all documents where tags is an
array that contains the string "red" as one of its elements:
For example, the following operation queries for all documents where the array
dim_cm contains at least one element whose value is greater than
25.
Specify Multiple Conditions for Array Elements
When specifying compound conditions on array elements, you can specify the query such that either a single array element meets these condition or any combination of array elements meets the conditions.
Query an Array with Compound Filter Conditions on the Array Elements
The following example queries for documents where the dim_cm array
contains elements that in some combination satisfy the query
conditions; e.g., one element can satisfy the greater than 15
condition and another element can satisfy the less than 20
condition, or a single element can satisfy both:
Query for an Array Element that Meets Multiple Criteria
Use $elemMatch operator to specify multiple criteria on the
elements of an array such that at least one array element satisfies all
the specified criteria.
The following example queries for documents where the dim_cm array
contains at least one element that is both greater than ($gt)
22 and less than ($lt) 30:
Query for an Element by the Array Index Position
Using dot notation, you can specify query conditions for an element at a particular index or position of the array. The array uses zero-based indexing.
Note
When querying using dot notation, the field and nested field must be inside quotation marks.
The following example queries for all documents where the second
element in the array dim_cm is greater than 25:
Query an Array by Array Length
Use the $size operator to query for arrays by number of
elements. For example, the following selects documents where the array
tags has 3 elements.
Additional Query Tutorials
For additional query examples, see: