php - 按三列分组在 CodeIgniter 中不起作用

Question

我需要一个包含 Group By 三列的结果，SQL 可以完美运行，没有任何问题。我在 CodeIgniter 框架中使用它时遇到了这个问题；它不执行查询。我的代码和SQL如下。

代码

$this->db->select(['trk.userid AS user_id', 'scr.course AS course_id'])
                     ->from('mdl_scorm scr')
                     ->join('mdl_scorm_scoes_track trk', 'scr.id = trk.scormid', 'inner')
                     ->join('mdl_course_modules mcs', 'mcs.instance = scr.id', 'inner')
                     ->where_in('trk.value', ['completed','incomplete','passed'])
                     ->group_by(['scr.course', 'trk.userid', 'trk.scormid'])
                     ->order_by('trk.userid', 'DESC');

SQL

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;

当 group_by 只有两列时，这很好用，比如，

->group_by(['scr.course', 'trk.userid'])

可能是什么原因？

Answer 1

In codeigniter group_by() works with two fields only.

---

$this->db->group_by()

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;