A　novel　private　database　query　protocol　with　only　one　quantum　state　is　proposed.　The　database　owner　Bob　sends　only　one　quantum　state　to　the　user　Alice.　The　proposed　protocol　combines　the　idea　of　semiquantum　key　distribution　and　private　query.　It　can　be　implemented　in　the　situation　where　not　all　the　parties　can　afford　expensive　quantum　resources　and　operations.　So　our　proposal　is　more　practical　in　use.　We　also　prove　that　the　proposed　protocol　is　secure　in　terms　of　the　user　security　and　the　database　security.