Edit

ARRAY_CONTAINS (Azure Cosmos DB)

  • Article
  • 2 minutes to read

APPLIES TO: NoSQL

Returns a Boolean indicating whether the array contains the specified value. You can check for a partial or full match of an object by using a boolean expression within the command.

Syntax

ARRAY_CONTAINS (<arr_expr>, <expr> [, bool_expr])

Arguments

arr_expr
Is the array expression to be searched.

expr
Is the expression to be found.

bool_expr
Is a boolean expression. If it evaluates to 'true' and if the specified search value is an object, the command checks for a partial match (the search object is a subset of one of the objects). If it evaluates to 'false', the command checks for a full match of all objects within the array. The default value if not specified is false.

Return types

Returns a Boolean value.

Examples

The following example how to check for membership in an array using ARRAY_CONTAINS.

SELECT   
           ARRAY_CONTAINS(["apples", "strawberries", "bananas"], "apples") AS b1,  
           ARRAY_CONTAINS(["apples", "strawberries", "bananas"], "mangoes") AS b2

Here is the result set.

[{"b1": true, "b2": false}]

The following example how to check for a partial match of a JSON in an array using ARRAY_CONTAINS.

SELECT  
    ARRAY_CONTAINS([{"name": "apples", "fresh": true}, {"name": "strawberries", "fresh": true}], {"name": "apples"}, true) AS b1, 
    ARRAY_CONTAINS([{"name": "apples", "fresh": true}, {"name": "strawberries", "fresh": true}], {"name": "apples"}) AS b2,
    ARRAY_CONTAINS([{"name": "apples", "fresh": true}, {"name": "strawberries", "fresh": true}], {"name": "mangoes"}, true) AS b3

Here is the result set.

[{
  "b1": true,
  "b2": false,
  "b3": false
}]

Remarks

This system function will benefit from a range index.

Next steps