如何在我的Codeigniter模型中使用SQL LEFT JOIN

Question

我使用我的Codeigniter模型中的LEFT JOIN进行查询。当我添加LEFT JOIN，我的网页不能正常工作，它告诉像下面

localhost的页面无法正常工作

本地主机是目前无法处理此请求。 HTTP错误500

这是我的查询。我添加了LEFT JOIN（不工作阶段）。我错了什么？请指导我。我是小白。

$sql = " 
     SELECT eu.user_id as user_id, DATE_FORMAT(eu.interview_plan_date, '%Y-%m-%d') as plan_date, DATE_FORMAT(eu.interview_plan_date, '%H:%i:%s') as start_time, DATE_FORMAT(DATE_ADD(eu.interview_plan_date, INTERVAL 1 HOUR), '%H:%i:%s') as end_time, count(1) AS cnt 
     FROM `entry_user_tbl` eu 
     LEFT JOIN m_admin ma 
     ON ma.admin_id = eu.interview_plan_staff 
     WHERE delete_flg = 0 
     AND interview_plan_date LIKE '$year-$month%' 
     AND CASE 
       WHEN (SELECT admin_flg FROM m_admin WHERE admin_id = {$login_id} AND delete_flg=0) = 0 THEN eu.interview_plan_staff = {$login_id} 
       WHEN {$id} <> 0 THEN eu.interview_plan_staff = {$id} 
       ELSE TRUE 
      END 
     GROUP BY DATE_FORMAT(interview_plan_date, '%Y%m%d') 
     "; 

Answer 1

如果这是你可能会首先打开你的显示错误数据库错误，在笨，你可以通过改变环境的编辑index.php页面来发展做

define('ENVIRONMENT', 'development');