将多行相加，并通过group_by一列进行更新。（Laravel elqoeunt）

Question

我想对MySQL表中的行求和，然后合并和更新。我正试图在一天内把所有的重复付款加起来。我将发布我现有的查询，但有一些限制。

示例：

+----+------------+-------------+-------------+---------+
| id |    date    | merchant_id | investor_id | payment |
+----+------------+-------------+-------------+---------+
|  1 | 27/05/1989 |           4 |           7 |    1000 |
|  2 | 27/05/1989 |           4 |           7 |    1200 |
|  3 | 28/05/1989 |           4 |           7 |    1500 |
|  4 | 28/05/1989 |           4 |           7 |    1000 |
|  5 | 28/05/1989 |           5 |           8 |    1000 |
+----+------------+-------------+-------------+---------+

预期结果：

+----+------------+-------------+-------------+---------+
| id |    date    | merchant_id | investor_id | payment |
+----+------------+-------------+-------------+---------+
|  1 | 27/05/1989 |           4 |           7 |    2200 |
|  3 | 28/05/1989 |           4 |           7 |    2500 |
|  5 | 28/05/1989 |           5 |           8 |    1000 |
+----+------------+-------------+-------------+---------+

我试过这个循环。

foreach ($existing_payments as $key => $payment) 
{
    ParticipentPayment::where('payment_date',$payment->payment_date) ->update(['payment' => \DB::raw("payment+$payment->payment"]);
}      

问题1.我一次只能更新一个专栏。

问题2。我以编程方式遍历行并更新值，因为如果没有重复的值，则行不会得到更新。我必须写另一个查询来更新。也可以删除现有查询。

问题3。它只适用于两次付款。

在laravel雄辩合并（和）多行和更新中是否有任何可能的解决方案？

Answer 1

试试这个：

$delete = [];
$payments = ParticipentPayment::selectRaw("GROUP_CONCAT(`id` SEPARATOR ',') `ids`")
    ->selectRaw('SUM(`payment`) `sum`')
    ->groupBy('date', 'merchant_id', 'investor_id')
    ->get();
foreach($payments as $payment)
{
    $ids = explode(',', $payment->ids);
    if(count($ids) == 1) continue;
    ParticipentPayment::whereKey($ids[0])->update(['payment' => $payment->sum]);
    $delete = array_merge($delete, array_slice($ids, 1));
}
ParticipentPayment::destroy($delete);