Query To Track Revision History

I would like to track the revision history of table records. To do so, I have created tables with two-key fields. A typical table is tblPO_Data. The first key field is PO_Number and the second key field is PO_Revision. Data fields follow.

A key element of this table is that each record may have any number of data fields left blank AND later revisions may only show the "changed" field values.

To Illustrate tblPO_Data:

PO_Number PO_Revision Length Width Height Weight Quant UPrice
100 _________0___________10_____15___________________2 ____20
200 _________0_______________________________________1 ____10

NOW I would like to create a query that lists one record for each PO number, showing the most recently revised data. The desired result would look like:

PO_Number PO_Revision Length Width Height Weight Quant UPrice
100_____________2_______10_____15_____35_____100__ ___2____20
200_____________0_________________________________ ___1____10

Please realize that this is an example. There would be numerous one to one tables for each PO number to reduce the number of blank fields (ie. only tables with changes would be get revised records).

Can someone suggest a way to create a query to accomplish the above requirements, thanks in advance, Jeff...

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Track Pricing History - Version: 2002 (10.0) XP

I am looking for a sample database or application that allows for tracking of pricing for stuff (products) over time. It would be similar to tracking the value of one's inventory as purchases and sales are made. The user could enter a "price point" on a given date or absent such point, the value of the product would be based on the last purchase or sales price.

Perhaps a simple concept would be to track the value of a portfolio of stock shares (microsoft for example). As one buys MSFT shares, the value of all the shares in the portfolio would reflect the most recent price at which the shares were either purchased or sold. In addition, one could enter a stock price on a specific date which would be used to reflect the value as of that date forward until a different price was entered or another purchase or sale transaction was made.

Finally, it would nice to be able to run a report that shows how the value of the portfolio changed during a specific period of time (monthly or over a specified start and end date).

Any thoughts or perhaps know of where something similar might have been created that would shed some light.

Best Regards,

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PS - If I do not answer quickly, it is because I may not be at work over the weekend. But I will read and respond to all answers sometime Monday

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