How to set a numeric field to the difference of two dates?

hi,
I need to create a table with a field containing a date (by def. current date) and another numeric field whose value is to be set to the difference (in days) between the current date and the date field. Something like this.
CREATE TABLE Tabdate
(fdate date default sysdate,
difference number default (sysdate-fdate))
I get this error:
column not allowed here
How can I do? please help me
thanks
Antonio

You cannot set field values as defaults. Create a pre-insert/update-trigger instead.

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