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fr_jc
Advocate I
Advocate I

New column to retrive an earlier row date

Hi, I am hoping someone may point me in the right direction with creating a column either by DAX or power query.  I've spent a bit of time looking for an example but can't seem to find one that I can use with the conditions i have.

 

I am wanting to add a calculated column of the days between dates of an account which exist on different rows, or if possible just return the previous date.

 

As an example I am trying to replicate the last two rows in this table.  Looking at the account of a row I am wanting to return the accounts previous original date.  My table has accounts which have multiple occurences where I am wanting just the previous date seen for each row.

 

Account

Original Date

Subsequent Follow Up Date

Days between previous original date of Account

Previous Date

2002

3/02/2021

1/03/2021

  

1001

1/05/2021

15/06/2021

  

3003

3/05/2021

31/05/2021

  

1001

15/06/2021

21/06/2021

51

1/05/2021

2002

1/07/2021

5/07/2021

20

3/02/2021

2002

5/07/2021

9/07/2021

8

1/07/2021

3003

31/07/2021

5/08/2021

94

3/05/2021

4004

1/09/2021

4/09/2021

  

 

 

Many thanks in advance

2 ACCEPTED SOLUTIONS
Greg_Deckler
Super User
Super User

@fr_jc See my article on Mean Time Between Failure (MTBF) which uses EARLIER: http://community.powerbi.com/t5/Community-Blog/Mean-Time-Between-Failure-MTBF-and-Power-BI/ba-p/3395....
The basic pattern is:
Column = 
  VAR __Current = [Value]
  VAR __PreviousDate = MAXX(FILTER('Table','Table'[Date] < EARLIER('Table'[Date])),[Date])

  VAR __Previous = MAXX(FILTER('Table',[Date]=__PreviousDate),[Value])
RETURN
  __Current - __Previous


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View solution in original post

@Greg_Deckler 

 

Many thanks Greg.  The bit I was strugling with was filtering by account and with your help in that article  there I could see what i was missing.

 

MAXX(
FILTER(
Warranty,
Warranty[Original Date] < EARLIER(Warranty[Original Date]) &&
Warranty[Account] = EARLIER(Warranty[Account])
),
Warranty[Original Date]
)

View solution in original post

3 REPLIES 3
Greg_Deckler
Super User
Super User

@fr_jc See my article on Mean Time Between Failure (MTBF) which uses EARLIER: http://community.powerbi.com/t5/Community-Blog/Mean-Time-Between-Failure-MTBF-and-Power-BI/ba-p/3395....
The basic pattern is:
Column = 
  VAR __Current = [Value]
  VAR __PreviousDate = MAXX(FILTER('Table','Table'[Date] < EARLIER('Table'[Date])),[Date])

  VAR __Previous = MAXX(FILTER('Table',[Date]=__PreviousDate),[Value])
RETURN
  __Current - __Previous


Follow on LinkedIn
@ me in replies or I'll lose your thread!!!
Instead of a Kudo, please vote for this idea
Become an expert!: Enterprise DNA
External Tools: MSHGQM
YouTube Channel!: Microsoft Hates Greg
Latest book!:
The Definitive Guide to Power Query (M)

DAX is easy, CALCULATE makes DAX hard...

@Greg_Deckler 

 

Many thanks Greg.  The bit I was strugling with was filtering by account and with your help in that article  there I could see what i was missing.

 

MAXX(
FILTER(
Warranty,
Warranty[Original Date] < EARLIER(Warranty[Original Date]) &&
Warranty[Account] = EARLIER(Warranty[Account])
),
Warranty[Original Date]
)

Speedy response.  I'll check it out

 

Thanks Greg

 

 

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