ProdID         Country              Price
----------- -------------------- ---------------------
    1          South Africa         12.34
    2          South Africa         12.34
    3          NULL                 12.35
    4          NULL                 12.99
    5          Brazil               13.43
    6          China                14.21
    7          United States        12.00
    8          United States        23.20
    9          England              12.34


select count(distinct country) from products?