laravel join關聯查詢

1、兩表關聯

$fbaInventoryTb = (new \App\Model\Amz\Fba\InventoryReport)->getTable();
$productTb = (new \App\Mwww.cppcns.comodel\Amz\Product)->getTable();
$twInventoryTb = (new \App\Model\TWUsa\TwusaInventory)->getTable();
$qry = \DB::table($fbaInventoryTb);
  $qry->select($fbaInventoryTb.'.*')
   ->where($fbaInventoryTb.'.ec_id',1)
   ->leftjoin($productTb,$productTb.'.sku','=',$fbaInventoryTb.'.sku')
   ->addSelect($productTb.'.id as goods_id',$productTb.'.sku as mfn',$productTb.'.ec_id as pro_ec_id');
//  ->where($productT
 
程式設計客棧b.'.ec_id',1); //不應該在此處排除 product 表的ec_id

//  return $qry->toSql();
  $res = $qry->get()->whereIn('pro_ec_id',[1,null] );//leftJion 最後排除不符合條件的

2、三表關聯

$qry = \DB::table($twInventoryTb);
  $qry->select($twInventoryTb.'.*')
   -&gdKSJhgt;leftjoin($fbaInventoryTb,$f程式設計客棧baInventoryTb.'.fnsku',$twInventoryTb.'.produc
 
程式設計客棧t_sn')
   ->addSelect($fbaInventoryTb.'.ec_id')
   ->where($fbaInventoryTb.'.ec_id',1);

  $qry->LeftJoin($productTb,$fbaInventoryTb.'.sku')
//   ->where($productTb.'.ec_id',1)
   ->addSelect($productTb.'.id as goods_id',$productTb.'.ec_id as pro_ec_id');

  $res = $qry->get()->whereIn('pro_ec_id',null]);

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