Cust_id    Date          information
12345    2015-04-03      blue hat
12345    2015-04-05      red scarf
54321    2015-04-12      yellow submarine

cust_id   change_number      Date       information
12345          1          2015-04-03    blue hat
12345          2          2015-04-05    red scarf
54321          1          2015-04-12    yellow submarine