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
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StudentLessonProgress::where( 'student_info_id' , $student_info_id )
->sum( 'total_left_class_num' );
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打印sql语句如下:
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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
]
]
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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
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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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以上这篇Laravel 对某一列进行筛选然后求和sum()的例子就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/zhezhebie/article/details/80322100