不是唯一的表/別名（codeigniter）

Question

錯誤號：1066

不是唯一的表格/別名：“帖子”

SELECT * FROM（SELECT id ， title ， keywords ，'posts'AS類型FROM posts ， posts UNION SELECT id ， title ， keywords ，'android'AS類型FROM android ， android UNION SELECT id ， title ， keywords ，'mac'AS類型從mac ， mac ）t到'％yj％'之類的t.title或像'％yj％'這樣的t.keywords

模型：

  $query = $this->input->GET('search', TRUE);
  $this->db->select("id, title, keywords, 'posts' AS type");
  $this->db->from("posts");

  $query1 = $this->db->get_compiled_select('posts');

  $this->db->select("id, title, keywords, 'android' AS type");
  $this->db->from("android");

  $query2 = $this->db->get_compiled_select('android');

  $this->db->select("id, title, keywords, 'mac' AS type");
  $this->db->from("mac");

  $query3 = $this->db->get_compiled_select('mac');


  $data = $this->db->query('SELECT * FROM (' . $query1 . ' UNION ' . $query2 . ' UNION ' . $query3 . ')' . "t WHERE t.title like '%$query%' OR t.keywords LIKE '%$query%'");
         return $data->result();

Answer 1

刪除表的所有第二個名稱，並改用UNION ALL：

SELECT * FROM (
  SELECT id, title, keywords, 'posts' AS type FROM  posts 
  UNION ALL 
  SELECT id, title, keywords, 'android' AS type FROM android 
  UNION ALL 
  SELECT id, title, keywords, 'mac' AS type FROM mac
)t WHERE t.title like '%yj%' OR t.keywords LIKE '%yj%'