1.从Customers表内选择在VA\GA\FL地区的客户
    SELECT *
    FROM Customers
    WHERE state = ‘VA’ OR state = ‘GA’ OR state = ‘FL’

    2.使用IN语句从Customers表内选择在VA\GA\FL地区的客户
    SELECT *
    FROM Customers
    WHERE state IN (‘VA’ ,’GA’, ‘FL’)

    3.从库存表内返回库存量等于49， 38， 72的产品
    SELECT *
    FROM products
    WHERE quantitiy_in_stock IN (49, 38, 72)