苦苦于自定义SQL查询

Question

我必须查询以下内容：

显示一个视图，该视图显示计算每个员工区域所有员工奉献的结果，并按字母顺序按区域名称列出。

$this->db->query('create temporary table temp as (select dedication.employee_employeeID, dedication ID, COUNT(area) AS TotalFrequency from dedication, employees where dedication.employee_employeeID = dedication group by dedication.employee_employeeID)');

但是，我的网站上似乎没有工作吗？

这是我的关系：

enter image description here