Codeigniter SELECT将检查多于MAX_JOIN_SIZE行

Question

我开发了一个考勤管理系统，我想通过运行以下查询生成报告，它将是大量的行，我在共享主机上并且得到以下错误：

查询：

SELECT 
 `attendance`.*, `users`.`id` AS user_id, 
CONCAT_WS(" ", `user_profiles`.`fname`, `user_profiles`.`lname` ) AS name,
`user_department`.`did`, `user_department`.`dep_name` FROM (`attendance`) 
    LEFT JOIN `users` ON `users`.`username` = `attendance`.`emp_code` 
    LEFT JOIN  `user_profiles` ON `user_profiles`.`user_id` = `users`.`id` 
    LEFT JOIN `in_department` ON `in_department`.`user_id` = `user_profiles`.`user_id`
    LEFT JOIN `user_department` ON `in_department`.`dep_id` = `user_department`.`did` 
WHERE `banned` = '0' 
   AND `for_date` >= '2012-05-28' 
   AND `for_date` <= '2012-06-28' 
ORDER BY `emp_code` asc, `for_date` asc

错误：

SELECT将检查超过MAX_JOIN_SIZE行;检查你的WHERE并使用SET SQL_BIG_SELECTS = 1或SET MAX_JOIN_SIZE =＃如果SELECT没问题

如何使用codeigniter中的活动记录运行此查询 SET SQL_BIG_SELECTS = 1

请帮助，我需要索引我的表

Answer 1

您只需发出包含SET命令的查询：

$this->db->query('SET SQL_BIG_SELECTS=1');