翻譯威爾遜比分信心SQL代碼Codeigniter活躍記錄

Question

我似乎無法將Wilson Score Confidence SQL代碼翻譯成Codeigniter活動記錄代碼。下面是威爾遜評分置信普通的SQL：

SELECT *, ((likes+ 1.9208)/(likes + dislikes) - 
        1.96 * SQRT((likes * dislikes)/(likes + dislikes) + 0.9604)/
          (likes + dislikes))/(1 + 3.8416/(likes + dislikes)) 
     AS ci_lower_bound FROM widgets WHERE likes + dislikes > 0 
     ORDER BY ci_lower_bound DESC; 

這是摘自：http://www.evanmiller.org/how-not-to-sort-by-average-rating.html

這裏是我嘗試翻譯這似乎不工作：

 $this->db->select('*, ((likes + 1.9208)/(likes + dislikes) - 1.96 * SQRT((likes * dislikes)/(likes + dislikes) + 0.9604)/(likes + dislikes))/(1 + 3.8416/(likes + dislikes)) AS ci_lower_bound'); 
     $this->db->where('likes + dislikes >', 0); 
     $this->db->order_by("ci_lower_bound", "desc"); 
     $query = $this->db->get('posts', $config['per_page'], $this->uri->segment(1)); 
     $data['results'] = $query->result(); 

結果最終總是空的。

Answer 1

嗯......原來我的代碼畢竟是正確的。 MySQL只是有一些小故障：

$this->db->select('*, ((likes + 1.9208)/(likes + dislikes) - 1.96 * SQRT((likes * dislikes)/(likes + dislikes) + 0.9604)/(likes + dislikes))/(1 + 3.8416/(likes + dislikes)) AS ci_lower_bound'); 
$this->db->where('likes + dislikes >', 0); 
$this->db->order_by("ci_lower_bound", "desc"); 
$query = $this->db->get('posts', $config['per_page'], $this->uri->segment(1)); 
$data['results'] = $query->result(); 

Answer 2

1.the table name has not been specified in code "widgets" 
try: 
     $this->db->from('widgets');