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-- drop table bleh;
create table bleh (id char(2) Primary Key,
parent_id char(2) );
insert into bleh VALUES ('A1', null);
insert into bleh VALUES ('A2', 'A1');
insert into bleh VALUES ('A3', 'A2');
insert into bleh VALUES ('A4', 'A3');
insert into bleh VALUES ('B1', null);