selective SUMPRODUCT

Hello,
I have a database made of:
column A - currency
column B - amount
column C - duration

criteria =currency
EUR

I need to calculate average duration for each currency.

I'm using:

DSUM(database;"amount";criteria) to get the total amount denominated in EUR

If I would have only one currency I can easily get the average duration by sumproduct(b:b;c:c) and then divide the result of sumproduct by  the result of dsum.
The issue is that I have many currencies, therefore I need a sumproduct which multiplies only values which have the same criteria as the dsum formula.
Is there a way to do it?

Thanks

Yuppydu
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Commented:
I think what you want is:

=average(SUMIF(range, EUR))

This fmla must be an array formula, so press Ctrl-Shift-Enter after typing it
Commented:
Actually, this works better:

=SUMIF(currency_range,"eur",duration_range)/COUNTIF(currency_range,"eur")

It still has to be an array formula.
Commented:
If you are using DSUM for the total Euros then why not DAVERAGE for the average?

=DAVERAGE(database;"amount";criteria)

regards, barry
Author Commented:
Probably I've not explained myself correctly:

What I need is to sum the product of column b and column c only for those rows which match the criteria
Commented:
OK, If you have a single currency then you can use SUMPRODUCT like this

=SUMPRODUCT((A2:A100="EUR")+0;B2:B100;C2:C100)

or for multiple currencies

=SUMPRODUCT(ISNUMBER(MATCH(A2:A100,criteria,0))+0;B2:B100;C2:C100)

regards, barry

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Author Commented:
here an example

currency     nominal    dur
eur              200000     5
eur            1000000     6
sek            5000000    10

criteria

currency
eur

Dsum(database;"nominal";"eur") gives me 1200000

I need a sumproduct of: 200000*5;1000000*6 i.e. only for pairs which have eur as currency value
Commented:
Sorry some of the commas in that second formula should be semi-colons like this

=SUMPRODUCT(ISNUMBER(MATCH(A2:A100;criteria;0))+0;B2:B100;C2:C100)

barry

Commented:
As per my previous answer but one.....

=SUMPRODUCT((A2:A100="EUR")+0;B2:B100;C2:C100)

barry

Author Commented:
Thanks Barry, as usual your formulas are precise, complete and easy to implement.
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