laravel join关联查询
1、两表关联
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$fbaInventoryTb = (new \App\Model\Amz\Fba\InventoryReport)->getTable();
$productTb = (new \App\Model\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', $productTb.'.ec_id as pro_ec_id');
// ->where($productTb.'.ec_id',1); //不应该在此处排除 product 表的ec_id
// return $qry->toSql();
$res = $qry->get()->whereIn('pro_ec_id',[1, null] );//leftJion 最后排除不符合条件的
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2、三表关联
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$qry = \DB::table($twInventoryTb);
$qry->select($twInventoryTb.'.*')
->leftjoin($fbaInventoryTb, $fbaInventoryTb.'.fnsku', '=', $twInventoryTb.'.product_sn')
->addSelect($fbaInventoryTb.'.ec_id')
->where($fbaInventoryTb.'.ec_id',1);
$qry->LeftJoin($productTb, $productTb.'.sku', '=', $fbaInventoryTb.'.sku')
// ->where($productTb.'.ec_id',1)
->addSelect($productTb.'.id as goods_id', $productTb.'.sku as mfn', $productTb.'.ec_id as pro_ec_id');
$res = $qry->get()->whereIn('pro_ec_id', [1, null]);
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原文链接：https://blog.csdn.net/weixin_42390015/article/details/89531474