Expression #1 of ORDER BY contains aggregate function and applies to the result of a non-aggregated query laravel code example

Example 1: Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'papertrade.kite_orders.id' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

SET GLOBAL sql_mode=(SELECT REPLACE(@@sql_mode,'ONLY_FULL_GROUP_BY',''));

Example 2: Expression #1 of ORDER BY contains aggregate function and applies to the result of a non-aggregated query laravel

1. set strict to false in config/databtase.php 
2. ->select([
		'exam_registrations.id',
        'exam_registrations.exam_id',
        'exam_registrations.user_id',
        DB::raw('sum(submissions.marks) as totalMarksGained')
     ])
     ->groupBy('exam_registrations.user_id')
     ->orderBy('totalMarksGained', 'DESC')