ROUND function in ODBC - sql

Question

I am working on a third-party custom flat file DB that I access through ODBC and the ROUND function is throwing errors always.
Is there a function that can do rounding in ODBC?
An example that throws an error:
SELECT AUDIT_SPLIT.ACCOUNT_REF, ROUND(SUM(AUDIT_SPLIT.GROSS_AMOUNT), 2) FROM AUDIT_SPLIT GROUP BY AUDIT_SPLIT.ACCOUNT_REF
Though Excel the error is "Column not found"

Answer 1

So I will try something like this:
SELECT A.ACCOUNT_REF, ROUND(SUM(A.GROSS_AMOUNT), 2) GROSS_AMOUNT_SUM
FROM AUDIT_SPLIT A
WHERE A.ACCOUNT_REF IS NOT NULL AND A.GROSS_AMOUNT IS NOT NULL
GROUP BY 1

Answer 2

Is your flat file something like a csv, a delimited text file or a fixed length file?
In this case I will suggest to check for the last line is not empty.
If the file ends with a cr/lf a new line is added and it is filled with nulls.
Also, from which client are you running the query? You have not given a name to ROUND() column, maybe you need it.
So I will try something like this:
SELECT A.ACCOUNT_REF, ROUND(SUM(A.GROSS_AMOUNT), 2) AS GROSS_AMOUNT_SUM
FROM AUDIT_SPLIT A
WHERE A.ACCOUNT_REF IS NOT NULL AND A.GROSS_AMOUNT IS NOT NULL
GROUP BY A.ACCOUNT_REF
UPDATE
Maybe the problem is related to the comma present in ROUND function, because it is interpreted as a column separator, you can avoid it using ODBC escape clause {fn ROUND()} (as suggested by jarlh in his comment), and to be sure and clear I will try to split the SUM() and the ROUND() in this way:
SELECT S.ACCOUNT_REF, {fn ROUND(S.GROSS_AMOUNT_SUM, 2)} AS ROUNDED_SUM
FROM (
SELECT A.ACCOUNT_REF, SUM(A.GROSS_AMOUNT) AS GROSS_AMOUNT_SUM
FROM AUDIT_SPLIT AS A
WHERE A.ACCOUNT_REF IS NOT NULL AND A.GROSS_AMOUNT IS NOT NULL
GROUP BY A.ACCOUNT_REF
) AS S