Schema for the one database in our system
Items(item_name: string, item_stock: integer, reorder_level: integer, unit:string, vendor_id:integer)
Vendors(id: integer, name: string, address: string)
Price(item_name: string, quantity: integer, date: date, price: integer)
has(item_name: string, requisition_number: integer, quantity_requested: integer, quantity_issued:integer)
Requisition(requisition_number: integer, date: date, department: string)
Purchase(vendor_id: integer, slip_id: integer, date: date)
included(slip_id: integer, item_name: string, cost_per_unit: integer, quantity: integer)