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Query an Array


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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:

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.

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.

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:

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:

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:

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.

For additional query examples, see:

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