Why don't I get the previous week sales with this measure?

[RGL]

Last Week Sales = 

CALCULATE( Sales ,FILTER(VALUES(Calendar[Date]), MAX(Calendar[Date])-7))

I get the same result (sales of the current day)

Example: 

Date               Sales    Last Week Sales

08/20/2022    175             175

08/21/2022     80               80

I need to get the sales from 08/13/2022 and 08/14/2022 in the "Last Week Sales" column

If I use ALL instead of VALUES I get the total sales of the current week, not from last week

[v-yangliu-msft · Accepted solution]

Hi @RGL ,

According to your description, When you use the DATEADD() function, it returns an error when using the week as a dimension, and returns null .Right?

DATEADD() is a time intelligence dax function. If you want to expand the Time-Dimension, it is recommended to use it in a standard date table to avoid errors.

You can also refer to the document: DATEADD()

Here are the steps you can follow：

(1)This is my test data:

(2)We can create a data table according our table ‘Sheet2’:

Calendar Table = ADDCOLUMNS(
CALENDAR(FIRSTDATE('Sheet2'[LastRefresh]),LASTDATE('Sheet2'[LastRefresh])),
"year", YEAR ( [Date] ),
"quarter", ROUNDUP(MONTH([Date])/3,0),
"month", MONTH([Date]),
"weeknum", weeknum([Date]),
"year & quarter", year([date]) & "Q" & ROUNDUP(MONTH([Date])/3,0),
"year & month", year([Date]) * 100 + MONTH([Date]),
"year & weeknum", year([Date]) * 100 + weeknum([Date]),
"weekday", WEEKDAY([Date])
)

We also need to create a one-to-many relationship between two tables, like this:

(3)We can create a measure : “Last Week Sales”:

Last Week Sales = CALCULATE(SUM('Sheet2'[Sales]),DATEADD('Calendar Table'[Date],-7,DAY))

Then the measure won’t return null now: (We need to use the field in our date table “Calendar Table”)

If this method does not meet your needs, you can provide us your sample data without sensitive data, or detailed input and output sample data, so that we can better help for you.

Best Regards,

Liu Yang

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

[amitchandak]

@RGL , Try like

CALCULATE( Sales ,dateadd(Calendar[Date]), -7, Day ))

Or you can refer the Rank approach

Power BI — Week on Week and WTD
https://medium.com/@amitchandak.1978/power-bi-wtd-questions-time-intelligence-4-5-98c30fab69d3
https://community.powerbi.com/t5/Community-Blog/Week-Is-Not-So-Weak-WTD-Last-WTD-and-This-Week-vs-La...
https://www.youtube.com/watch?v=pnAesWxYgJ8

Why Time Intelligence Fails - Powerbi 5 Savior Steps for TI :https://youtu.be/OBf0rjpp5Hw
https://amitchandak.medium.com/power-bi-5-key-points-to-make-time-intelligence-successful-bd52912a5b...

[RGL]

I tried CALCULATE( Sales ,dateadd(Calendar[Date]), -7, Day )) 

and it works in a table by date like the one I showed in my example

BUT when ,  instead of date, I group by week number, I get blanks,

why don't I get the aggregate of the previous week sales?