drop table t_group;
drop table t_user;


create table t_group
(
	id integer,primary key (id)
);
create table t_user
(
	id integer,name text,groupId integer,primary key(id),foreign key (groupId) references  t_group(id) on delete cascade on update cascade
);


insert into t_group values(1);

insert into t_group values(2);


insert into t_user values(1,"j",2);
insert into t_user values(2,"a",3);