title: How to select product that have the maximum price of each category?
body: <p>The below is my table that has the item such as:</p>
  
  <pre><code>ProductId       ProductName Category        Price
        1            Tiger      Beer          $12.00
        2             ABC       Beer          $13.99
        3            Anchor     Beer          $9.00
        4            Apolo      Wine          $10.88
        5           Randonal    Wine          $18.90
        6            Wisky      Wine          $30.19
        7             Coca     Beverage       $2.00
        8            Sting     Beverage       $5.00
        9             Spy      Beverage       $4.00
       10           Angkor      Beer          $12.88
  </code></pre>
  
  <p>And I suppose that I have only three <code>category</code> in this table (I can have a lot of <code>category</code> in this table). And I want to show the maximum product's price of each <code>category</code> in this table.</p>