CREATE TABLE tab1(c1 INTEGER GENERATED ALWAYS AS IDENTITY,

   c2 INTEGER GENERATED BY DEFAULT AS IDENTITY);

identity_clause::=  GENERATED [ ALWAYS | BY DEFAULT [ ON NULL ] ] AS IDENTITY [ ( identity_options ) ]

identity_options::=   { START WITH ( integer | LIMIT VALUE )

                    | INCREMENT BY integer

                    | ( MAXVALUE integer | NOMAXVALUE )

                    | ( MINVALUE integer | NOMINVALUE )

                    | ( CYCLE | NOCYCLE )

                    | ( CACHE integer | NOCACHE )

                    | ( ORDER | NOORDER ) }...