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IS_NULL (Azure Cosmos DB)

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APPLIES TO: NoSQL

Returns a Boolean value indicating if the type of the specified expression is null.

Syntax

IS_NULL(<expr>)

Arguments

expr
Is any expression.

Return types

Returns a Boolean expression.

Examples

The following example checks objects of JSON Boolean, number, string, null, object, array, and undefined types using the IS_NULL function.

SELECT   
    IS_NULL(true) AS isNull1,   
    IS_NULL(1) AS isNull2,  
    IS_NULL("value") AS isNull3,   
    IS_NULL(null) AS isNull4,  
    IS_NULL({prop: "value"}) AS isNull5,   
    IS_NULL([1, 2, 3]) AS isNull6,  
    IS_NULL({prop: "value"}.prop2) AS isNull7

Here is the result set.

[{"isNull1":false,"isNull2":false,"isNull3":false,"isNull4":true,"isNull5":false,"isNull6":false,"isNull7":false}]

Remarks

This system function will benefit from a range index.

Next steps