From Command in qlikview

[tenyeapen]

i have a data named InvoiceTAT loaded from the database. I need to call this in a if condition in script area. can some one please suggest how the From statement should be?

[wade12]

TableName:

LOAD

Field1,

Field2,

...

If(Currency='Euro', SaleAmount*ExchangeRate, SaleAmount)     as SaleAmount,

...

FROM DataSource;