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The above highlights the difference when a value is evaluated during execution as opposed to a constant value. QODBC will lose the jumpin/index capability on the date when you apply a function to it.
If you are looking just for yesterday's transactions, then the TxnDateMacro is the one to use :-
SELECT invoiceline.TxnID FROM invoiceline WHERE TxnDateMacro = 'Yesterday'
or for this month:
SELECT invoiceline.TxnID FROM invoiceline WHERE TxnDateMacro = 'ThisMonth'
As it provides constants relative to the date. Other built-in TxnDateMacro values are :-
