What sql function can I use?

Dear all,
I have 2 sets of data and they are the followings:
Invoice No. Invoice Date Apply Date Amount
======================================
A123 01-Nov-2005 11-Nov-2005 1000
A123 01-Nov-2005 18-Nov-2005 500
Under this circumstances, for the same "Invoice No." for different "Apply Date", I want to get the minimum Apply Date. As a result, the following 2 sets of data I would like to get.
Invoice No. Invoice Date Apply Date Amount
======================================
A123 01-Nov-2005 11-Nov-2005 1000
A123 01-Nov-2005 11-Nov-2005 500
Thanks,
Amy

Try this.
select invoice_no, invoice_date,
min(invoice_date) over (partition by invoice_no) as apply_date,
amount
from your_table;

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