codeigniter lefting joinで重複するデータが入ってくる

Question

SELECT * 
FROM `tbl_schedule_task` AS `E` 
JOIN `tbl_schedule` AS `S` ON `S`.`schedule_id`=`E`.`schedule_id` 
JOIN `tbl_schedule_frequency` AS `F` ON `F`.`frequency_id`=`S`.`frequency_id` 
JOIN `tbl_equipments` AS `M` ON `M`.`equipment_id`=`E`.`equipment_id` 
LEFT JOIN `tbl_schedule_checklist` AS `L` ON `L`.`check_list_id`=`E`.`check_list_id` 
LEFT JOIN `tbl_tech_groups` AS `G` ON `G`.`group_id` = `S`.`shedule_assign_id` 
LEFT JOIN `tbl_tech_technicians` AS `T` ON `T`.`techgroup_id`=`G`.`group_id` 
LEFT JOIN `tbl_schedule_category` AS `SC` ON `SC`.`category_id`=`S`.`category_id` 
JOIN `tbl_site_users` AS `U` ON `U`.`user_id`=`E`.`created_by` 
WHERE `E`.`site_id` = '1' 
    AND (`E`.`approve_flg` =0 
     AND `E`.`check_out` = 1) 
    AND `E`.`approve_by` = '2' 
ORDER BY `E`.`task_id` DESC 

Answer 1

重複するデータが返されている可能性があります。上記のクエリの左の結合の前に内部の結合をチェックしてください。