add new location field for Griffith

location of the DVD (room/box/case/etc) locations table =============== loc_id - primary key parent_id - foreign key to locations.loc_id (same table) (NULLable) name - varchar +case 1 (loc_id=1, parent_id=NULL) | | | |________box1 (loc_id=2, parent_id=1) | | | | | |_______foo (loc_id=5, parent_id=...