dsum? or sumproduct? how?

N

Nimit Mehta

A folder contains 1100 files of international calling
customers. All .xls files are named unique (client's name)
and have same fileds in all.

Coloumn A Coloumn B

DATE MINUTES

22-june-04 54
22-june-04 34
23-june-04 12



Another client.xls

Coloumn A Coloumn B

DATE MINUTES

16-june-04 54
22-june-04 72
23-june-04 12

One main reports.xls files is linked with all clients from
where i can just open the file and see current balance,
total deposits and stuff about all clients at one go,
without opening individual files.

I am looking for a way to check the daily consumed minutes.
I want to have a fuction where in if i enter 22-june-04 in
a cell, it should look for 22-june04 in all 1200 files and
add up minutes in same row. ( in above case should give
160 minutes, 2 calls from first client adding up to 88 and
1 call from another client.xls 72, total 160.)
Please Note: VLOOKUP wont work as it looks for first match
only, one client can have more than one calls made on the
same day itself.
DSUM works, but i have to keep all sheets open. Keeping
all 1200 sheets open would need 8 high speed processors
and GBs of RAM..:)
SUMPRODUCT might work, ummmm
A kick on my rear end is required.
Thanks a lot.
 

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