topic Re: Slowly changing dimensions current status vs history in DAX Commands and Tips

Slowly changing dimensions current status vs history

Janou — Mon, 05 May 2025 16:06:33 GMT

Hi,

I have been struggling with a way to visualize data in the present and in the past while using slowly changing dimensions.

The data looks like this:

id	state	prio	start_date	end_date
123	open	low	4/1/2025	4/1/2025
456	open	high	4/1/2025	4/1/2025
456	closed	high	5/1/2025	5/1/2025
789	open	medium	5/1/2025	5/1/2025

Next to this, I loaded an calendar table that is not connected to the table above.

With below measure I am able to create a trendline to show the status per month, showing 2 open items in April and 1 open item in May.

CALCULATE(COUNT(Table[ID]), FILTER(Table[start_date] <= max(calendar[date]) && Table[end_date] >= min(calendar[date]) || Table[end_date] = blank()))

I am also able to get the current status (latest) by doing a simple count on the id and filter on end_date = latest.

What I would like to achieve is a measure that combines the two functionalities:

- Showing the current status by default

- Showing the previous status (e.g. April (2 open items)) when selecting that month in the trendline as described above.

How could I set that up?

Re: Slowly changing dimensions current status vs history

lbendlin — Mon, 05 May 2025 18:30:13 GMT

What you have is fact data, not an SCD2.

How do you plan to "select that month in the trendline" ?

Re: Slowly changing dimensions current status vs history

maruthisp — Thu, 08 May 2025 03:07:59 GMT

Hi Janou,

As per my undestanding, there are few things to consider:

1. SCD Type 2 should be implemented in the Fact Tables by using MERGE statements/ INSERT-UPDATE statements.
2. If you are not doing in the tables levels, then need to do it in the DAX. I feel bit tricking to do it.

Please find the attached pbix file for your reference as per the sample data which you provided.

Slowly changing dimensions current status vs history.pbix

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Best Regards,

Maruthi

LinkedIn - http://www.linkedin.com/in/maruthi-siva-prasad/

X - Maruthi Siva Prasad - (@MaruthiSP) / X

Re: Slowly changing dimensions current status vs history

Janou — Mon, 12 May 2025 16:30:33 GMT

That worked! Thank you!

Re: Slowly changing dimensions current status vs history

maruthisp — Wed, 14 May 2025 00:54:02 GMT

I am glad to hear as it worked for you! 👍