DB Scripts:

create table parent (id serial, parent_name character varying(20));
create table child (id serial, parent_id integer not null, sex character varying(10));

INSERT INTO public.parent(parent_name) values('Cemalettin');
INSERT INTO public.parent(parent_name) values('Kemalettin');

INSERT INTO public.child (parent_id, sex) VALUES(1, 'girl');

INSERT INTO public.child (parent_id, sex) VALUES(1, 'girl');

INSERT INTO public.child (parent_id, sex) VALUES(1, 'boy');

GRANT ALL ON TABLE parent TO mb_core;
GRANT ALL ON TABLE child TO mb_core;