title: select row till which sum less than 25 of count_visitor column
body: <pre>
  visitor_keyword                    count_visitor
  
  Homepage                                14
  Web developing                           6
  Page Mobile application                  4
  Developing websites for ipad             3
  Android developing                       2
  Android developing in new hampshire      2
  Android development                      2
  
  </pre>
  
  <p>I want the output upto the sum of the count_visitor column is 25 from first row</p>
  
  <p>ie: the output we get is only top 3rows</p>
  
  <p>My sql query is</p>
  
  <pre><code>select visitor_keyword, COUNT(visitor_keyword) AS count_visitor
  from handlegraph
  group by visitor_keyword
  order by count_visitor DESC
  </code></pre>