title: Delete Sqlite Table on Activity start
body: <p>How i can delete sqlite table when my application start.</p>
  
  <p>my DataBaseHelper have: </p>
  
  <pre><code>@Override
  public void onUpgrade(SQLiteDatabase _db, int _oldVersion, int _newVersion) 
  {
     _db.execSQL("DROP TABLE IF EXISTS CARS");
  }
  </code></pre>
  
  <p>But when app start nothing is happening. I want to drop tables if they exist on every start of application.</p>
  
  <p>Thanx</p>