magento 1.9 – Do not get the information about the commands – NULL (line level)

I tried unsuccessfully to get line level information regarding a specific command but I receive the header information.

Look at this picture:

Example

This is my request:

select o.increment_id, o.status, oi.price_incl_tax, t.carrier_code, o.created_at, oi.price_pvp, oi.created_at, o.shipping_instruction, o.payment_term
from sales_flat_order o
join sales_flat_order_item oi
on o.entity_id = oi.order_id
left join sales_flat_shipment_track t
on o.entity_id = t.order_id
where oi.parent_item_id is null

What's wrong? Can you help me solve this problem?