title: dosent work group by with where con dintion query in android
body: <p>i try to two difrent table data combine in single query by using where condition and group by ,but cant work this query.</p>
  
  <pre><code>cur=dh.rawQuery("select _milkid,milkType,milkLitre,totalAmount from MilkDetail where milkDate='"+reportDate+"'" GROUP BY milkType, null);
  </code></pre>