ID,購入日,購入金額,購入回数,累積購入金額
"A",2020-06-01,600,1,600
"A",2020-07-12,500,2,1100
"A",2020-08-12,1300,3,2400
"A",2020-09-01,1500,4,3900
"A",2020-09-02,1800,5,5700
"A",2020-09-08,1500,6,7200
"A",2020-09-20,3000,7,10200
"A",2020-11-02,1200,8,11400
"A",2021-01-21,1590,9,12990
"B",2020-05-11,600,1,600
"B",2020-06-23,500,2,1100
"B",2020-12-28,1270,3,2370
"B",2021-02-21,1350,4,3720
"B",2021-04-03,1150,5,4870
"C",2020-04-05,900,1,900
"C",2020-09-12,1850,2,2750