is null operator

Applies to: Databricks SQL Databricks Runtime

Tests whether expr is NULL.

Syntax

expr is [not] null

Arguments

• expr: An expression of any type.

Returns

A BOOLEAN.

If not is specified this operator is a synonym for isnotnull(expr). Otherwise the operator is a synonym for isnull(expr).

If expr is a VARIANT result of a:

• JSON path expression with a valid path,
• parse_json function,
• variant_explode table-valued function, or
• variant_explode_outer table-valued function

the result of is null is always false. Use the is_variant_null function function to check if the VARIANT encoded value is NULL, or cast the VARIANT to a specific type and check if the result is NULL.

Examples

> SELECT 1 is null;
 false

> SELECT 1 is not null;
 true

Related functions

• isnotnull function
• isnull function
• isnan function
• is false operator
• is true operator
• is_variant_null function