Best way to do a lookup with multiple tables

Hello,
I am looking for an example or how to do a lookup through ESB XSL transformation. What I am wanting to accomplish is something like below:
I am reading in a flat file and then want to use a field in that file to do a lookup in multiple tables.
i.e.
Select c.customer_name
from customers c, order_lines ol, order_headers oh
where ol.customer_id = c.customer_id
and ol.header_id = oh.header_id
and oh.order_number = p_order_num;
I know that there is the lookup-table function but didnt know if that would work with this scenario. Any suggestions are appreciated.
Thanks,
Jason
Edited by: Colby J on Oct 21, 2008 11:13 AM

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Jeff·Þ·Bohrer wrote:
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