Hi, I think your query should be written as follows:
SELECT CustomerID, CopyID, DateOut, DateDue, DateReturned,
0.5 * (DateReturned - DateDue) AS Fines, FinesPayed
FROM LoanRes
WHERE CustomerID = :CustomerIDor
SELECT CustomerID, CopyID, DateOut, DateDue, DateReturned,
0.5 * (DateReturned...