Not_Null_Constraints View
Describes the NOT NULL constraints.

Column | Data Type | N | Description
RECORD_NUMBER | integer | n | unique identifier for this record of metadata
CONSTRAINT_CATALOG | identifier | n | constraint catalog
CONSTRAINT_SCHEMA | identifier | n | constraint schema
CONSTRAINT_NAME | identifier | n | constraint name
TABLE_CATALOG | identifier | n | table catalog
TABLE_SCHEMA | identifier | n | table schema
TABLE_NAME | identifier | n | table name
COLUMN_NAME | identifier | n | column name