title: selecting only values having difference greater than 0 (no negatives and 0)
body: <p>i've two columns in mysql db table <strong>votes</strong> : <strong>accept</strong> and <strong>reject</strong></p>
  
  <p>i want to query only the top result after the <strong>accept-reject</strong> column values</p>
  
  <pre><code>table : votes
  =================
   accept | reject
  =================
     7    |   9
     5    |   1
     2    |   15
     5    |   1
  </code></pre>
  
  <p>i want just the positive and top value, here <strong>5</strong>-<strong>1</strong> = <strong>4</strong>
  actually, i've lot of other columns along with accept and reject..i just want to <strong>ORDER</strong> the results by the top value of <strong>difference(positive only)</strong> and <strong>LIMIT</strong> it to 1 so that i can get the one row i want..was i clear? :)
  how to write query for this?
  thanks..</p>