order_id,customer_id,subscription_id,purchase_date
1,3,2,1/10/2017
2,2,4,1/9/2017
3,3,4,1/26/2017
4,9,9,1/4/2017
5,7,5,1/25/2017
6,8,2,1/18/2017
7,5,8,1/11/2017
8,9,5,1/26/2017
9,4,4,1/25/2017
10,1,7,1/26/2017
11,5,4,1/7/2017
12,3,2,1/21/2017
13,3,5,1/3/2017
14,6,5,1/22/2017
15,1,2,1/6/2017
16,1,2,1/11/2017
17,3,6,1/17/2017
18,3,8,1/29/2017
19,4,9,1/3/2017
20,1,7,1/24/2017