merge two rows where value are null

Hi all,
sorry if OT. I have the following using case:

Name, Surname , Job, Hobby, Pet, address
John, Smith,   NULL, photo, NULL, NULL
John, Smith,   student, NULL, cat, NULL

by using name and surname as selecting key, I want :

John, Smith,   student, photo, cat, NULL

that is I want to substitute the null valus of the LAST row with not-null
value of previous one.

how  can I perform that ? in may installed vesion there aren't function as
merge and collect.

Thanks in advance

GIU

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