Whats wrong with my code Laravel Callback function GroupBy Month - mysql

Question

Im going to count my pallet_condition 0,1,2,3 and group it by month
but i always got an error like this please help whats wrong with my code.
something wrong with my date_format?
My Error
SQLSTATE[23000]: Integrity constraint violation: 1052 Column 'created_at' in group statement is ambiguous (SQL: select count(*) as aggregate from `liip_psrm` inner join `liip_psrm_items` on `liip_psrm`.`id` = `liip_psrm_items`.`psrm_items_id` where date(`liip_psrm_items`.`created_at`) >= 2018-10-09 and date(`liip_psrm_items`.`created_at`) <= 2019-01-31 and `liip_psrm`.`status` = 0 and `liip_psrm`.`customer_id` = 14 and `pallet_condition` = 0 group by WEEK(created_at) order by WEEK(created_at) asc)
My Callback function
$problem_condition_computations = function($condition) use ($psrm_maintenance, $start, $end, $customers){
return DB::table('liip_psrm')
->join('liip_psrm_items', 'liip_psrm.id', '=', 'liip_psrm_items.psrm_items_id')
->whereDate('liip_psrm_items.created_at', '>=', $start)
->whereDate('liip_psrm_items.created_at', '<=', $end)
->select(
DB::raw("DATE_FORMAT(liip_psrm_items.created_at, '%Y-%m-%d') AS dates
"))
->where('liip_psrm.status','=', 0)
->where('liip_psrm.customer_id','=',$customers)
->where('pallet_condition', $condition)
->groupBy('dates')
->count();
};

Answer 1

"dates" field you are using in groupBy is alias name, So it do not identifying it and not working as you are expecting.
Same as you used in Select
DB::raw("DATE_FORMAT(liip_psrm_items.created_at, '%Y-%m-%d') AS dates")
Put it in GroupBy
& It will work.
Hope, It will help, Let me know if you still find difficulties.