How to select only a single data from many record?

Hi,
I ‘m trying to select data from oracle database to excel. I faced difficulty to select one data for each id, where for one id, we got many row.
The other one is how to make sure that the id is selected from database match properly with the id that already in excel.
The connection between database and excel can establish, I think the sql statement should be changed. Anyone can help me with sql syntax? Any assistance would be greatly appreciated.

Thanks.