Laravel 对某一列进行筛选然后求和sum()的例子

Laravel 对某一列进行筛选然后求和sum()的例子 这个例子是对课程进度表里面的某个学生的剩余课时进行求和汇总。

laravel 版本是 lts 5.5

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

 

打印sql语句如下：

array:1 [▼ 

0 => array:3 [▼ 
“query” => “select sum(total_left_class_num) as aggregate from student_lesson_progress where student_info_id = ?” 
“bindings” => array:1 [▶] 
“time” => 51.48 
] 
]
 

二、需要多个sum

laravel中怎么实现下面的SQL

select sum(‘profit'),sum(‘order_count') from products where……;

参考

 
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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