Later in our examples, you will need a second table. This table will
contain information about suppliers of our inventory items, which items they
supply, and the cost of the item from that supplier.
Create a table called SUPPLIERS in SAMPLELIB. This table will have
three columns: SUPPLIER_NUMBER, ITEM_NUMBER, and SUPPLIER_COST. Notice
that this table has a common column with table INVENTORY_LIST: ITEM_NUMBER.
Rather than create a new ITEM_NUMBER column, you can copy the column definition
used for ITEM_NUMBER in INVENTORY_LIST table.