*在codeigniter中，group_by() * 仅适用于 * 两个字段 。
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允许您编写查询的GROUP BY部分：

$this->db->group_by(array("title", "date"));  // Produces: GROUP BY title, date

CI 3 × group_by()

编辑01

$query=$this->db->query("
        SELECT `trk`.`userid` AS user_id, `scr`.`course` AS course_id 
        FROM `mdl_scorm` scr 
        INNER JOIN `mdl_scorm_scoes_track` trk 
        ON `scr`.`id` = `trk`.`scormid` 
        INNER JOIN `mdl_course_modules` mcs 
        ON `mcs`.`instance` = `scr`.`id` 
        WHERE `trk`.`value` IN ('completed', 'incomplete', 'passed') 
        GROUP BY `scr`.`course`, `trk`.`userid`, `trk`.`scormid` 
        ORDER BY `trk`.`userid` 
        DESC LIMIT 0,100;");

$result = $query->result_array();
return $result;

考虑模型中的原始查询。

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class xyz_model extends CI_Model{
     function __construct()
     {
          // Call the Model constructor
          parent::__construct();
     }

     function get_this_thing($month,$year) 
     {    $myQuery="SELECT `trk`.`userid` AS user_id, `scr`.`course` AS course_id 
          FROM `mdl_scorm` scr 
          INNER JOIN `mdl_scorm_scoes_track` trk 
          ON `scr`.`id` = `trk`.`scormid` 
          INNER JOIN `mdl_course_modules` mcs 
          ON `mcs`.`instance` = `scr`.`id` 
          WHERE `trk`.`value` IN ('completed', 'incomplete', 'passed') 
          GROUP BY `scr`.`course`, `trk`.`userid`, `trk`.`scormid` 
          ORDER BY `trk`.`userid` 
          DESC LIMIT 0,100;";

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

          $result = $query->result();
          return $result;
     }
}

您也可以传递多个值的数组：

$this->db->group_by(array("title", "date"));  // Produces: GROUP BY title, date

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使用结果数组而不是结果，如

return $query->result_array();