title: jQuery: table with grouping and sum in group footer/header?
body: <p>I'm looking for a jQuery-solution which enables sorting and grouping by columns; then, in the footer section, it should be possible to show the sum of all values above.</p>
  
  <p>Example: I've got three columns: Country, Date and Sales:</p>
  
  <pre><code>US     20120714       50
  DE     20120714       40
  BR     20120714       30
  US     20120715       60
  DE     20120715       60
  BR     20120715       20
  </code></pre>
  
  <p>If I sort by country:</p>
  
  <pre><code>BR     20120714       30
  BR     20120715       20
                        50
  DE     20120714       40
  DE     20120715       60
                       100
  US     20120714       50
  US     20120715       60
                       110
  </code></pre>
  
  <p>If I sort by date:</p>
  
  <pre><code>BR     20120714       30
  DE     20120714       40
  US     20120714       50
                       120
  BR     20120715       20
  DE     20120715       60
  US     20120715       60
                       140
  </code></pre>
  
  <p>and so on...</p>
  
  <p>Is there a plugin available for this?</p>