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Join condition with date ranges

Join condition with date ranges

(OP)
I have two tables I need to join to an invoice table.  

There are 4 primary keys on the invoice table:
account_num   upc      sales_id   date
10            001005   356        04/01/2009

The other two tables, discount and promotion, describe specific incentives that are in place.  The structure of these tables is as follows:

account_num   upc      sales_id   begin_date   end_date
10            001005   356        01/01/2009   05/31/2009

I'm trying to compare these feilds based on the date of the sale:

invoice.price, discount.price - promotion.price

My problem is I am unsure of how to join the invoice table given I have a date range rather than a list of dates that a particular promotion/discount would be in place.

Thanks in advance!  

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