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mysql クエリを codeigniter クエリに変換する

現在のクエリ:


$query = "SELECT a.*, b.cost AS future_cost, b.start_date AS future_date
          FROM (
            SELECT * FROM (
              SELECT * FROM outbound_routes 
              ORDER BY start_date
            ) x 
          GROUP BY pattern
          ) a
          LEFT JOIN (
            SELECT * FROM outbound_routes 
            ORDER BY start_date
          ) b 
          ON a.pattern = b.pattern AND a.id != b.id
          GROUP BY a.pattern";

$result=$this->db->query($query);

太字のクエリでは、次のような検索変数を追加したい

 $this->db->where('pattern','1');

どんな助けやアイデアも大歓迎です。

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