I am working with SQL developer with Oracle 11g. I have a query that looks something along the lines of this;
SELECT [column], [column], [column],...... rs.n
In Oracle if you just want to remove a character you can omit the third argument of the replace call and the function for character codes is chr(), not char().
So your line would be SELECT ... replace(rs.notes,chr(10)) ...
SELECT ... replace(rs.notes,chr(10)) ...