Date Value from previous record

[maico_presente]

Hello,

I've been working on a problem for hours and can't get any further! HELP ;-))

I have a list of users who belong to a group from a certain date.
If a user is moved to another group i have another entry with the new "from" date.

I need a new column (date_to) that says until when the user was in the group. If there is no newer entry the date of today should be entered.

user_number	group_id	date_from
123	xy	10.11.2015
123	ab	05.07.2017
123	de	26.09.2019
456	xy	05.12.2016
456	de	03.03.2019

expected result:

user_number	group_id	date_from	date_to
123	xy	10.11.2015	04.07.2017
123	ab	05.07.2017	25.09.2019
123	de	26.09.2019	12.12.2019
456	xy	05.12.2016	02.03.2019
456	de	03.03.2019	12.12.2019

[V-pazhen-msft · Accepted solution]

@maico_presente 

You would need to add an index column in power query that allows you to look at the value from the previous row.

date_to =
VAR currentindex = 'Table'[Index]
VAR lastrowdate =
    CALCULATE (
        MAX ( 'Table'[date_from] ),
        ALLEXCEPT ( 'Table', 'Table'[user_number] ),
        FILTER ( 'Table', 'Table'[Index] = currentindex + 1 )
    )
RETURN
    IF (
        [date_from]
            = CALCULATE ( MAX ( [date_from] ), ALLEXCEPT ( 'Table', 'Table'[user_number] ) ),
        TODAY (),
        lastrowdate - 1
    )

Sample pbix: https://microsoftapc-my.sharepoint.com/:u:/g/personal/v-pazhen_microsoft_com/EUYxhep3tNpGk3Tinz6bPQQ...

Paul
Best

[maico_presente]

@V-pazhen-msft 
Fantastic!!! Thank you sooooo much!!!

[Anonymous]

Imke Feldmann has created a very useful function for shifting columns up and down:

https://www.thebiccountant.com/2018/07/12/fast-and-easy-way-to-reference-previous-or-next-rows-in-po...

The article above explains well how you can achieve your goal, but I will give a short summary. First, sort your table. Shift your date column with the mentioned function, the resulting column might be called date_from.Next. Then you can create a new column (like  date_to = if date_from.Next = null then DateTime.LocalNow() else Date.AddDays(date_from.Next, -1)) that contains the data you want.