Recently,　Jakobi　et　al.　(Phys　Rev　A　83,　022301,　2011)　suggested　the　first　practical　private　database　query　protocol　(J-protocol)　based　on　the　Scarani　et　al.　(Phys　Rev　Lett　92,　057901,　2004)　quantum　key　distribution　protocol.　Unfortunately,　the　J-protocol　is　just　a　cheat-sensitive　private　database　query　protocol.　In　this　paper,　we　present　an　idealized　relativistic　quantum　private　database　query　protocol　based　on　Minkowski　causality　and　the　properties　of　quantum　information.　Also,　we　prove　that　the　protocol　is　secure　in　terms　of　the　user　security　and　the　database　security.