Laravel 对某一列进行筛选然后求和sum()的例子

StudentLessonProgress::where('student_info_id', $student_info_id)
   ->sum('total_left_class_num');

array:1 [▼ 
0 => array:3 [▼ 
“query” => “select sum(total_left_class_num) as aggregate from student_lesson_progress where student_info_id = "htmlcode">

Product::where('status',1)->first(
 array(
  \DB::raw('SUM(profit) as profit'),
  \DB::raw('SUM(order_count) as order_count')
 )
)->toArray();


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