title: Mysql order by two colums independetly
body: <p>I have one table in mysql:</p>
  
  <p>Table 1</p>
  
  <pre><code>ID       DiscountPrice    ActualPrice
  1        2299.00             2874.00
  2        0                   50
  3        2999.00             3499.00
  4        0.00                4999.00
  5        3899.00             5999.00
  </code></pre>
  
  <p>I want this should come in sorted order(lowest should come first)</p>
  
  <p>Output:</p>
  
  <pre><code>ID: 2 , 1, 3, 5, 4
  </code></pre>
  
  <p>Please help me.</p>