Hope you can help me!
I need to build a chart with the sales info of this year (column) day per day (rows) and the sales info of this day but last year (column). I mean, don´t have to compare with the exact date, but with the date that this weekday last year was.
In my database, among other data, I have a column with all the dates day per day of this year and last year (dd/mm/yyy) and another column with their respective sales per day.
EXAMPLE DATA BASE:
Date Sales Sales LY Dif.
01/08/2016 15.000 19.000 - 4.000
02/08/2016 23.000 16.000 7.000
**Comparing 01/08/2016 with 03/08/2015 (same weekday last year)
Surely it is quite simple, but I'm stuck and I need some help :S