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help with crystal sql expression

Last Modified: 2012-06-27
Hi There Experts.
Please can you help, I cant get this to work correctly.
I have a table Invoice with a field invoice date.  I have created a table to hold euro exchange rates.
I want to use the exchange rate that is valid when the invoice was created to do calculations, so I thought best way was to create an SQL expression field, which I did as follows:
(SELECT EuroRates."EuroRate"
FROM EuroRates, Invoice
WHERE EuroRates."ValidDate" =
(SELECT MIN(EuroRates."ValidDate")
FROM EuroRates
WHERE ABS(DATEDIFF(DAY,Invoice."InvDate",EuroRates."ValidDate"))=
(SELECT MIN(ABS(DATEDIFF(DAY,Invoice."InvDate",EuroRates."ValidDate")))
FROM EuroRates, Invoice))
I know I need to join the tables EuroRates and Invoice somehow but I can't seem to get it right!
Thanks in advance
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