CREATE SEQUENCE domain_option_id_seq
    INCREMENT BY 1
    NO MAXVALUE
    NO MINVALUE
    CACHE 1;

CREATE TABLE domain_option (
    domain_option_id integer DEFAULT nextval(('"domain_option_id_seq"'::text)::regclass) NOT NULL,
    domain_option_name character varying(50) NOT NULL
);

CREATE TABLE domain__domain_option (
	domain_option_id integer NOT NULL;
	domain_id integer NOT NULL;
); 

ALTER TABLE ONLY domain__domain_option
    ADD CONSTRAINT domain_option_id_fkey FOREIGN KEY (domain_option_id) 
    	REFERENCES domain_option(domain_option_id) DEFERRABLE;

ALTER TABLE ONLY domain__domain_option
    ADD CONSTRAINT domain_id_fkey FOREIGN KEY (domain_id) 
    	REFERENCES domain(domain_id) DEFERRABLE;