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
);

ALTER TABLE ONLY domain_option
    ADD CONSTRAINT domain_option_uniq UNIQUE (domain_option_id);

CREATE UNIQUE INDEX ON domain_option ( domain_option_name );

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

CREATE UNIQUE INDEX unique_domain__domain_option ON domain__domain_option USING btree (domain_option_id, domain_id);

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;