create table tree0 (
  id integer not null primary key,
  p integer,
  v integer 
);

insert into tree0 values (11, null, null);
insert into tree0 values (12, 11, null);
insert into tree0 values (13, 11, null);
insert into tree0 values (14, 11, 4000);
insert into tree0 values (15, 12, 1000);
insert into tree0 values (16, 12, 1100);
insert into tree0 values (17, 13, null);
insert into tree0 values (18, 13, 300);
insert into tree0 values (19, 17, 500);
insert into tree0 values (20, 17, 501);
insert into tree0 values (21, 17, 502);