Hello,
I have a big table with different dates and some customerids.
For example,
date, customerid
01/10/2016, 100001
05/09/2015, 100001
03/06/2013, 100001
01/10/2016, 100002
05/09/2015, 100002
05/09/2015, 100003
03/06/2013, 100004
03/06/2013, 100005
The sequence of dates is random, so there...