-- the 'data' field means nothing. it's just an arbitrary text
INSERT INTO test (parent, data) VALUES(1, 'root:A');		-- id:2
INSERT INTO test (parent, data) VALUES(1, 'root:B');		-- id:3
INSERT INTO test (parent, data) VALUES(2, 'root:A:A');		-- id:4
INSERT INTO test (parent, data) VALUES(2, 'root:A:B');		-- id:5
INSERT INTO test (parent, data) VALUES(5, 'root:A:B:A');	-- id:6
INSERT INTO test (parent, data) VALUES(1, 'root:C');		-- id:7