I am trying to design a base for employee contracts, with some employees having salaries paid in multiple currencies.
The way I intended to design this was to have a contract table, where the contract date and employee name would be written in fields, and have a ‘contract details’ table with multiple lines per contract, one per currency.
The way I intended to consolidate the total compensation was to convert everything in USD in the “contract details” table, and then to sum it back in the Contract table. But for this I need some way to fetch the exchange rate.
This is where I get stuck. How can I achieve this?
What I would have done in Excel for instance, would be to have another table with yearly rows/records, and 1 field/column per currency, and then index/match/lookup the exchange rate for the given year and currency as a new field in the ‘contract details’ table. I could then multiply this exchange rate with the salary to get the amount in USD.
In other words, how do I populate this field with data from another table, knowing that it needs to correspond to both the currency and date?