Laravel - SUM和balane查询

Question

我有一个Laravel应用程序。我正在尝试计算列的平衡和平衡。你能帮我解决一下如何为此编写SQL。

+---------+----------+--------+----------+----------+------------+
| pay_id  | username | income | outgoings| balance  |     date   |
+---------+----------+--------+----------+----------+------------+
|    1    |   john   |  1000  |          |   1000   | 00.00.2016 |
|    2    |   jack   |        |   500    |    500   | 00.00.2016 |
|    3    |   john   |  1500  |          |   2000   | 00.00.2016 |
|    4    |   bill   |        |  1000    |   1000   | 00.00.2016 |
+---------+----------+--------+----------+----------+------------+
                        2500     1500        

Answer 1

如果您正在使用Eloquent：

Model::where('username', 'john')->sum('balance');

https://laravel.com/docs/5.3/eloquent#retrieving-single-models

Answer 2

如果您想要对多列进行求和，那么您必须向我们DB::raw

$data = Model::get([
        DB::raw('SUM(income) AS total_income'),
        DB::raw('SUM(outgoings) AS total_outgoings'),
        DB::raw('SUM(balance) AS total_balance')
    ]);
dd($data);

或者

$data = Model::select(
        DB::raw('SUM(income) AS total_income'), 
        DB::raw('SUM(outgoings) AS total_outgoings'), 
        DB::raw('SUM(balance) AS total_balance')
    )
    ->get();
dd($data);