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                            這個例子是對課程進度表里面的某個學生的剩余課時進行求和匯總。
## laravel 版本是 lts 5.5

```
StudentLessonProgress::where('student_info_id', $student_info_id)
            ->sum('total_left_class_num');
```
 
打印sql語句如下：

```
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、需要多個sum
laravel中怎么實現下面的SQL

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

參考

```
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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