Hi @kyeong_yun ,
It sounds like you don't have enough data for a comparison. Your columns are either all unique values (#SampleID, Description, and Type) or only consist of one value (BodySite).
You're going to have a really hard time doing any statistics with just two samples. (We had a big discussion about some of that here, recently.) However, the long and short of it is that you can't do statitics with just two samples, and that there are no comparisons to be made.
Best,
Justine