Calculate total last year in all rows in 1 column

[OSLacour]

Hello. I want to calculate for example the total amount of the sales from previous year and show this amount in the column 'total sales 2018'. 

How can I do this? Thanks for a response. 

Year	Total sales	Total sales 2018
2017	10000	12500
2018	12500	12500
2019	14000	12500

[guiborlenghi · Accepted solution]

Hello!

To calculate the total from distinct periods, we need to use the functions of "time intelligence". For that, we need a "Calendar Table". So, here's what we gotta do:

1- Create a new column in the date format based on your Year;

NewDate = DATE([Year];1;1)
// This will generate a column with the dates "01/01/2017", "01/01/2018", "01/01/2019"

2- Create a Calendar Table

Using the button "New Table", insert the DAX below:

Calendar = 
// Will generate a table called "Calendar", starting on "01/01/2017" and finishing at "01/01/2019"
CALENDAR( 
     MIN(Sales[NewDate]); 
     MAX(Sales[NewDate]) 
)

3- Create a relationship between the "Sales" and "Calendar" tables using the columns Sales[NewDate] (many side) and Calendar[Date] (one side). In this case, the relationship will be "one to one", assuming that we have only one row for each Year in the Sales table.

4- Create the new metric for the total sales amount from previous year:

Total Sales Previous Year = 
CALCULATE(
    [Total Sales];
    PREVIOUSYEAR('Calendar'[Date])
)

5- Enjoy

Result Using the "Total Sales Previous Year"

If that solved your issues, remember to mark this as the correct awnser.

And if that's not what you were looking for, let me know and I will do the best to help you again.

[OSLacour]

Thank you very much.