DATEDIFF Difference

[Penn]

Hi Everyone,

I have three calculated columns, and the last one is a calculated column to compare the date diff of the first two.

The result looks very normal in model tab, for example

Item ID        Date Start      Date Finish    Date Diff

S1077098   22/05/2017    23/05/2017          1

However when I create a table in the dashboard, it shows like this

Case ID        Date Start      Date Finish    Date Diff

S1077098   22/05/2017    23/05/2017          3

I guess this has something to do with row level, becuase I have three status for this case. How should I fix this?

The DAX that I used to calcute the date diff is 

DateDiff = DATEDIFF('TableA'[Status Start Date], 'TableA'[Status Finish Date], DAY)

Thank you

[edhans]

Just throwing this out there. It may be that you have 3 records for that case ID, and DateDiff of 1 3 times is 3. If that is what is happening, you could tell it to not summarize that data in the data setting for that field. Or set to FIRST or LAST as it should be the same.

Or create a measure that does the calculation at the aggregate level of your table vs calculated columns. Without seeing your table, it would be something along the lines of:

Date Difference =
DATEDIFF ( MAX ( DataTable[Date Start] ), MAX ( DataTable[Date Finish] ), DAY )

[Penn]

Hi @edhans 

Can you explain more about the first option? How to get it not summarize that data in the data setting for that field. And how to set to FIRST or LAST? Thanks

[edhans · Accepted solution]

It would be on that field dropdown. It may not be first/last. I was looking at another model with text. But could be min/max, which would be the same in this case.

Not a big fan of this approach, as I prefer measures, but seeing if we can get you what you want without starting over with where your data calculations are.

[Penn]

Thanks! @edhans 

The DAX works fine and I will look into the first option