codeigniter活动记录嵌套查询 [英] codeigniter active record nested query

问题描述

我有一个问题，将下面的MySQL code到A codeigniter活动记录查询。

I'm having a problem converting below MySQL code to a Codeigniter active record query.

SELECT sss.*, c.country_name, c.country_code 
  FROM ( SELECT gr.* 
           FROM (`be_goldrate` as `gr`) 
          WHERE `gr`.`country_id` != 0 
            AND `gr`.`rate_type` = 'calculated' 
           ORDER BY gr.date DESC ) as sss 
   LEFT JOIN `be_countries` as `c` 
     ON `c`.`country_id`=`sss`.`country_id`  
   GROUP BY `sss`.`country_id`

我已经试过的建议<一href="http://heybigname.com/2009/09/18/using-$c$c-igniters-active-record-class-to-create-subqueries/"相对=nofollow>此处但没有成功。

推荐答案

你只需要检查的 codeigniter文档

     $this->db->select('sss.*, c.country_name, c.country_code ');
       $this->db->from('(SELECT gr.* 
       FROM (`be_goldrate` as `gr`) 
      WHERE `gr`.`country_id` != 0 
        AND `gr`.`rate_type` = "calculated" 
       ORDER BY gr.date DESC) as sss');
       $this->db->join('be_countries as c','c.country_id = sss.country_id','left');

       $this->db->group_by('sss.country_id'); 

请报告如有错误

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