Question

错误号：1066

不是唯一的表格/别名：“帖子”

SELECT * FROM（选择id，title，keywords，“帖子” AS类型FROM   posts，posts UNION SELECT id，title，keywords，'android'AS   键入FROM android，android UNION SELECT id，title，keywords，   'mac'AS类型FROM mac，mac} t t.title如'％yj％'或   t.keywords like'％yj％'

型号：

  $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

删除表的所有第二个名称，并改用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%'

不是唯一的表/别名（codeigniter）

1 个答案: