nullable_7.xml

<dataset>
    <t_order order_id="1700" sku_num="0" status="init" />
    <t_order order_id="1701" sku_num="1" status="init" />
    <t_order order_id="2700" sku_num="2" status="init" />
    <t_order order_id="2701" sku_num="3" status="init" />
</dataset>