SkuIsAbsentInCatalogCondition.php

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<?php
declare(strict_types=1);

namespace Magento\InventorySales\Model\ResourceModel\IsStockItemSalableCondition;

use Magento\Framework\DB\Select;

class SkuIsAbsentInCatalogCondition implements GetIsStockItemSalableConditionInterface
{
    public function execute(Select $select): string
    {
        return 'product.sku IS NULL';
    }
}