CUSTOMERS (Customer_ID, Customer First Name, Customer Last Name)
VEHICLES (Vehicle_ID, Vehicle Make, Vehicle Model, Vehicle Year)
CUSTOMERS_VEHICLES (Customer_ID, Vehicle_ID)
MECHANICS (Mechanic_ID, Mechanic First Name, Mechanics Last Name)
SERVICEWRITERS (ServiceWriter_ID, Service Writer First Name, Service Writers Last Name)
WORKORDERS (WorkOrder_ID, Work Order Date) 
JOBS (JOB_ID, Job Description, Job Price)
CUSTOMERS_WORKORDERS (Customer_ID, WorkOrder_ID)
SERVICEWRITERS_WORKORDERS (ServiceWriter_ID, WorkOrder_ID)
MECHANICS_WORKORDERS (Mechanic_ID, WorkOrder_ID)
JOBS_WORKORDERS (WorkOrder_ID, JOB_ID)
PARTS (Part_ID, Part Name)
JOBS_PARTS (JOB_ID, Part_ID, Quantity)
SUPPLIERS (Supplier_ID, Supplier Name)
PARTS_SUPPLIERS (Part_ID, Supplier_ID, Price)
PARTMAKE (PartMake_ID, Part Make)
PARTMODEL (PartModel_ID, Part Model)
PARTYEAR (PartYear_ID, Part Year)
PARTS_PARTMAKE (Part_ID, PartMake_ID)
PARTMODEL (Part_ID, PartModel_ID)
PARTYEAR (Part_ID, PartYear_ID)