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create table region_gadget
(
    region_gadget_id  number(38)  not null,
    region_id         number(38)  not null,
    person_gadget_id  number(38)  not null,
    render_seq        number(10)  not null,
    collapsed         varchar2(1) not null,    
    constraint region_gadget_pk 
        primary key (region_gadget_id),         
    constraint region_gadget_unq 
        unique (region_id, person_gadget_id),
    constraint chk_region_gadget_collapsed
        check (collapsed in ('Y','N'))        	
);

alter table region_gadget
add constraint region_gadget_region_id_fk
foreign key (region_id)
references region (region_id);

alter table region_gadget
add constraint region_gadget_gadget_id_fk
foreign key (person_gadget_id)
references person_gadget (person_gadget_id);