Detect and store change in source value

[Conn811]

Hi,

I'm importing (not DirectQuery) data from a SQL db that I do not controll. 

For one of the tables i need to detect, and store the date, when a cell value changes.

For instance, image the table below (just an example).

I want to detect when a car is sold (Status = Sold) and store that date when it was registered as sold(for instance in a calculated column in PowerBI)

How do i manage that? Is it possible to use DAX to query that last import? 

Example on a code syntax

IF( Source.Status == "Sold")

   IF( OldImported.Status != "Sold)

      NewImported.Date = TodaysDate()

  ELSE

      NewImported.Date = OldImported.Date

ELSE

   NewImported.DateSold = ""

Id	Description	Price	Status
1	2011 VW Passat	$ 65 000,00	Available
2	2012 VW Touran	$ 75 000,00	Available
3	2008 VW Passat	$ 49 000,00	Not available
4	2016 VW Passat	$ 83 000,00	Sold
5	2010 VW Touran	$ 58 000,00	Available
6	2012 VW Golf	$ 66 000,00	Not available

[TomMartens · Accepted solution]

Hey,

unfortunately this is not possible, due to the following.

Basically you are importing the full data from the database.

The OldImported.Date will be calculated during the load, this means you can't use an existing value.

There may be a possibility to circumvent the mentioned above if you are on Power Premium and just load increments, but this woluld also mean that you have identify the increment, the change in the source data.

Here you will an introduction into incremental refresh of Power BI Service:

https://docs.microsoft.com/en-us/power-bi/service-premium-incremental-refresh

Regards,

Tom 

[Conn811]

Hi

I feared that might be the case. Thank you very much for the answer.

Regards,

Pål-Arve Nilsen