Compare two dates with NULL in one

I am trying to do the following with a simple SQL. Compare two dates and get the latest one, but the greatest() function always returns NULL if NULL is present. So how can I do it ?
Date1 Date2 Desired Result
Null 01-Dec-09 01-Dec-09
01-May-09 01-Mar-09 01-May-09
01-May-09 NULL 01-May-09
01-May-09 01-Nov-09 01-Nov-09
NULL NULL NULL
Any suggestion ? Thanks

Hi,
Try this,
create table test1
fdate date,
tdate date
insert into test1 values (null,'25-jan-2010');
select greatest(nvl(fdate,tdate),nvl(tdate,fdate)) greatest from test1;
Thanks&Regards,
Jai

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