How to display the biggest of the numbers

[#1]

If I have 3 numbers

ID Num

1     10

1      60

3      90.

Here for ID 1 i only want to display 60 which is the largest among 10 and 60.How do I do that ?

Thank you.

[sunny_talwar]

Not sure, but may be this:

=Aggr(Date(Max([Lease Expiration Date])), AB1Key)

[#3]

Sorry,but this is giving me the lease exp date instead of ABKey(which is my ID field)

sunindia‌