Operators

IS operators

IS operators return TRUE or FALSE for the condition they are testing. They never return NULL, even for NULL inputs. (BigQuery SQL Language Reference IS operators)

BigQuery	Snowflake
X IS TRUE	NVL(X, FALSE)
X IS NOT TRUE	NVL(NOT X, TRUE)
X IS FALSE	NVL(NOT X, FALSE)
X IS NOT FALSE	NVL(X, TRUE)
X IS NULL	X IS NULL
X IS NOT NULL	X IS NOT NULL
X IS UNKNOWN	X IS NULL
X IS NOT UNKNOWN	X IS NOT NULL