Finding The Difference Between Two Column From Two Different Datasets

Hi

I always seem to come back to dataset issues. Nonetheless, here is my problem:

I am retrieving data using a stored procedure that lists the number of bookings per hour and the revenue that generates also per hour. So, you enter a single date in the stored procedure, for example 2001-10-01 and it will bring back 24 rows corresponding to the 24 hours (obviously) and two columns, one displaying the number of bookings and one displaying how much revenue.

Pretty simple so far.

I have a report using SQL Reporting Services that allows users to enter two dates and therefore you get two tables with the relevant dates data. For example, table one has date 1's data and table 2 has as you'd expect date 2's data. Both tables use different datasets.

The reason why I am using different tables and different datasets is that the stored procedure I use only allows the use of one date at a time therefore, I use a second dataset to generate the second date's data.

The problem occurs when I want to calculate a difference between the two date's data, for example have another table that shows the differrence between table one and table two for bookings for each corresponding hour.

Anyone have any ideas as to how I could achieve this?