Greetings! I seek the help of fellow monks once again. This is with regard to a friend of mine, who gave me a csv containing a database dump.
Below is a sample of the dump. 
Date   Product   Quantity   Imported_From
1/2/04 Shirts     32         Australia
1/9/04 Shoes      234        Asia
2/12/04 Caps      109        UK
4/4/04 Shoes      6          Asia
4/4/04 Shirts     12         Australia
5/6/04 Shirts     398        Australia
.....
......

There are only 3 regions.
One or more products can be imported from one or many regions on a sin
+gle date.
No single column is unique.
There are many products, at the last count, it was 34.

[download]
What is needed is a summary of the report on a monthly basis. This would help in analyzing import-sales ratio for every month. (There is a similar dump for sales. That is a simpler one which does not include the 'region' field.) Output monthly report should look like: 
Jan
Product Asia   Australia   UK   Total_Imported
Shirts  178    12          744  934
Shoes  ...
...
(products whose total is zero can be omitted)

Feb
Product Asia   Australia   UK   Total_Imported
....

[download]
I've worked on this for more than a couple of hours now using hashes and makeing '$date_$product' as key and quantity as its value. Using more hashes to seperate the regions. I've also tried to write to temp files and re-creating them for each month.

Is there a simple way to get the whole thing done in a single loop?
I'd appreciate any comments/thoughts from you folks.

Many thanks!
Rupesh.

In reply to (Complex)Data Manipulation by rupesh

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