Question (Thai):  บุคคลที่ซื้อ Nikon D เป็นผู้ดำเนินการตั๋วจำนวนเท่าใด
Question (English): How many ticket ID were conducted by the person who purchased Nikon D?
Table: customer
Pandas: df[df['Product_Purchased'] == 'Nikon D'].shape[0]