如何对 laravel 中的多个子查询进行 SUM 操作

Question

我有 3 张桌子，名为 pencairan、induk_pencairan、turunan_belanja。 现在我想在另一个表中显示 total_order 但它的相关表，你可以看到这个表是这样的：

彭凯然

pencairan
+----+------------+------------+------------+
| id |  induk_id  | price      |   qty   
+----+------------+------------+------------+
|  1 |   1        |   1000     |    10   //  so from this i can create total 10000 from (price*qty)
+----+------------+------------+------------+
|  2 |   1        |   2000     |    5    // and this 10000
+----+------------+------------+------------+
|  3 |   2        |   5000     |    10   // and this 50000
+----+------------+------------+------------+
|  4 |   2        |   1000     |    10   // and this 10000
+----+------------+------------+------------+

induk_pencairan:

induk_pencairan
+----+------------+------------+------------+
| id |turunan_id  | some_data  |    some_data
+----+------------+------------+------------+
|  1 |   1        | some_data  |        -> this total is 20000 from pencairan table
+----+------------+------------+------------+
|  2 |   1        | some_data  |        -> total = 60000
+----+------------+------------+------------+
|  3 |   2        | some_data  |        -> total ....
+----+------------+------------+------------+
|  4 |   2        | some_data  |        -> total ....
+----+------------+------------+------------+

turunan_belanja:

turunan_belanja
+----+------------+------------+------------+
| id |    name    | balance    |  some data . . .
+----+------------+------------+------------+
|  1 |   phone    | 10000000   |      -> in here i want to show 80000 its total from induk_pencairan
+----+------------+------------+------------+
|  2 |     PC     | 50000000   |      -> . . . . .
+----+------------+------------+------------+
|  3 | Electronic | 500000000  |      -> . . .  .
+----+------------+------------+------------+

这 3 个表是相关的，现在我想显示这样的数据：

turunan_belanja
+----+------------+------------+------------+
| id |  name      |  balance   |   total_order (its from table induk_pencairan)
+----+------------+------------+------------+
|  1 |   phone    | 10000000   |    80000
+----+------------+------------+------------+
|  2 |     PC     | 50000000   |    ......
+----+------------+------------+------------+
|  3 | Electronic | 50000000   |    . . .  .
+----+------------+------------+------------+

和我的关系

 Models IndukPencairan
    public function induk_pencairan()
    {
        return $this->belongsTo(\App\Models\IndukPencairan::class ,'turunan_id');
    }

 Models Pencairan
    public function pencairan()
    {
        return $this->belongsTo(\App\Models\Order::class ,'induk_id');
    }

所以我能为此做些什么？？？

我现在的步骤就是像这样选择 category_order ：

 public function get_belanja()
    {
        $belanja = TurunanBelanja::where('status', 'active')->get();
        return response()->json($belanja ,200);
    }

更新，我像这样创建这个子查询，但是在第二个查询有错误

     $belanja = DB::table("induk_pencairan")
    ->select("induk_pencairan.*",
              DB::raw("(SELECT SUM(pencairan.harga*qty) FROM pencairan
                          WHERE pencairan.indukpencairan_id = induk_pencairan.id
                          GROUP BY pencairan.indukpencairan_id) as product_stock"))
    ->get();

    $belanja2 = DB::table("turunan_belanja")
    ->select("turunan_belanja.*",
              DB::raw("(SELECT SUM(product_stock) FROM induk_pencairan
                          WHERE induk_pencairan.rek_id = turunan_belanja.id
                          GROUP BY induk_pencairan.rek_id) as total"))
    ->get();

错误是UNDEFINED COLUMN product_stock - 如何将此 product_stock 从查询 1 解析到查询 2？

Answer 1

在纯 SQL 中，您可以在单个查询中获取聚合数据

select t.id,
  t.name,
  t.balance,
  coalesce(sum(p.price * p.qty),0) total_order
from turunan_belanja t
left join induk_pencairan i on t.id  =i.turunan_id
left join pencairan p on i.id = p.induk_id
group by t.id,
  t.name,
  t.balance

演示

您可以将 laravel 查询生成器的上述查询转换为

$results = DB::table('turunan_belanja AS t')
    ->select([
    't.id',
    't.name',
    't.balance'
    DB::raw('coalesce(sum(p.price * p.qty),0) AS total_order')
    ])
    ->leftJoin('induk_pencairan AS i', 'i.turunan_id', '=', 't.id' )
    ->leftJoin('pencairan AS p', 'p.induk_id', '=', 'i.id')
    ->groupBy('t.id')
    ->groupBy('t.name')
    ->groupBy('t.balance')
    ->get();