Запрос количество товаров только в наличии
$oQB = Core_QueryBuilder::select('shop_items.id')
->from('shop_items')
->join('shop_warehouse_items', 'shop_warehouse_items.shop_item_id', '=', 'shop_items.id')
->join('shop_warehouses', 'shop_warehouses.id', '=', 'shop_warehouse_items.shop_warehouse_id')
->where('shop_items.active', '=', 1)
->where('shop_items.deleted', '=', 0)
->where('shop_items.shop_id', '=', 3)
->where('shop_warehouses.active', '=', 1)
->where('shop_warehouses.deleted', '=', 0)
->groupBy('shop_items.id')
->having(Core_QueryBuilder::expression('SUM(shop_warehouse_items.count)'), '>', 0);
$oCore_QueryBuilder_Select = Core_QueryBuilder::select(array(Core_QueryBuilder::raw('COUNT(*)'), 'count'))
->from(array($oQB, 'x'));
$row = $oCore_QueryBuilder_Select->execute()->asObject()->current();
echo 'Сегодня в продаже ' . $row->count . ' ' . Core_Str::declensionNumber($row->count, 'товар', 'товара', 'товаров');