Special Conditions

The IS operator tests for special conditions, such as nulls, infinity and values that are not numbers.

Table 1-9 Special Conditions Operators

Operator	Description
`IS INFINITE`	Returns true if the expression is infinite, or false otherwise. For mappings only.
`IS NAN`	Returns true if the expression is not a number, or false otherwise. For mappings only.
`IS NULL`	Returns true if the expression is null, or false otherwise.

Syntax

expr IS [ NOT ] NULL

13 IS NOT NULL is true.