How to include data from 2 unlinked tables

I am using VB6 and CR10 & SQL Server 7
I am working on an inventory project nw.. I'm new to crystal reports..

For the report i need to pick data from 2 tables(Sales_Details, Purchase_Details)
There is no link between these 2 tables (except a similarity that both have got a date field)

TABLE 1
Sale_Date... SalesQty
01/01/07...... 50
01/03/07...... 24
01/04/07...... 10

TABLE 2
Purch_Date... Purchase Qty
01/01/07 ....... 100
01/06/07 ....... 100

I need to take a report which shows the movement of a particular Item based on date range
It should look like this

------x----x----x
Date ......... Sales.......Purchase
------x----x----x

01/01/07 ........ 50 ........ 100
01/03/07 ........ 24 ........ 0
01/04/07 ........ 10 ........ 0
01/06/07 ........ 0 ........ 100
--------------
I tried inner and outer joins to links these tables, but all in vein( data is getting repeated then), tried with groups also..no use

Pleeeaaase... help me to do this...
This may be a simple issue for most of you...
But i am a beginner.. i need your valuable help..
Plzzzzz...Just to make sure, but there are no PKeys in either one of your tables?|||You say you need to report by item, so surely there must be some sort of item code in both tables otherwise how do you know what item you're buying / selling?|||Ofcourse item code is there... For sake of simplicity i dint mention that.

Actually both the purchase and sales table has the fileds- Date, Itemcode, Quantity

Sales Table

Date...... ItemCode........Qnty
------------
01/01/07 ..A001............50
01/03/07...A001............24
01/04/07...A001............10

Purchase Table
Date...... ItemCode........Qnty
------------
01/01/07...A001............100
01/06/07...A001............100

and i need a report (like the one mentioned above)based on the movement of Item -A001 ..

Please...........|||First:
You wrote:

There is no link between these 2 tables (except a similarity that both have got a date field)
This is the reason for the questions now I assume itemcode is your link.
Next you will group by date and itemcode if you want, now for grouping by date go to options and choose section to be printed by day.
Then you will need to create formulas that will check to see the quantity of sales and purchases.

Something like:

If {Sales.quantity} > 0
Then {Sales.quantity}
Else 0

Hope that helps,
GJ