Date Difference function in Teradata

To get the difference between dates in Teradata you do not have to use any date diff functions. Its a simple A - B calculation where A and B are date columns. This works in a SQL query. But when you try the same through Cognos, the difference calculation gets pushed to the Cognos server side rather than being handled at the DB side. To work-around this, use the _days_between Cognos function and then notice that the Native SQL now includes an A - B calculation.