Generate Dates between 2 dates

I have a requirement where I need to create a forecast report for the next 90 days. I am able to group data from the database and get it datewise in the following format:

Material     Date            Qty

XXXX          Today        4

XXXX          Today+1    5

XXXX          Today+3    2

I am able to display it in WEBI in the required format using crosstab

                    Today          Today+1          Today+3......

XXXX               4                    5                    2

However in the above example, the date (Today+2) is missing in the SQL and thus in the crosstab. There is no qty available for that date (Today+2) in the database hence the SQL I created, did not group any data for that date.

How do I create my sql that it generates all the dates bewteen current date  and current date + 90 and then displays the corresponding qty for the dates available.

Thanks