Skip to main content
cancel
Showing results for 
Search instead for 
Did you mean: 

Earn a 50% discount on the DP-600 certification exam by completing the Fabric 30 Days to Learn It challenge.

Reply
Reto_Swiss
New Member

To append/merge/add Rows based on a start and an end date.

How could I solve this problem best.

My table is looking like that before:

Reto_Swiss_0-1677709371087.png

After the process I should have a copy of the rows with all the dates between Start and End.
How I solve this Problem the best way.
Your answers and solutions are very appreciated. Thank you!

1 ACCEPTED SOLUTION
edhans
Super User
Super User

The following formula in a new column will generate all dates between the start and end date. 

List.Dates([Start], Duration.Days([End] - [Start]), #duration(1,0,0,0))

Then expand to new rows.

edhans_0-1677716003108.png

becomes this:

edhans_1-1677716061483.png

 

Full code sample:

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45W8spPVdJRMtQ31DcyMDKAM41BTAM9U6VYnWil4MRcsIQpSI0hRI0BiG0EYivFxgIA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Name = _t, Start = _t, End = _t, Pension = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Start", type date}, {"End", type date}}),
    #"Added Date LIst" = Table.AddColumn(#"Changed Type", "Date List", each List.Dates([Start], Duration.Days([End] - [Start]), #duration(1,0,0,0))),
    #"Expanded Date List" = Table.ExpandListColumn(#"Added Date LIst", "Date List")
in
    #"Expanded Date List"

How to use M code provided in a blank query:
1) In Power Query, select New Source, then Blank Query
2) On the Home ribbon, select "Advanced Editor" button
3) Remove everything you see, then paste the M code I've given you in that box.
4) Press Done
5) See this article if you need help using this M code in your model.

 

If that isn't what you need, provide a clearer explanation per info below.

 

How to get good help fast. Help us help you.

How To Ask A Technical Question If you Really Want An Answer

How to Get Your Question Answered Quickly - Give us a good and concise explanation
How to provide sample data in the Power BI Forum - Provide data in a table format per the link, or share an Excel/CSV file via OneDrive, Dropbox, etc.. Provide expected output using a screenshot of Excel or other image. Do not provide a screenshot of the source data. I cannot paste an image into Power BI tables.



Did I answer your question? Mark my post as a solution!
Did my answers help arrive at a solution? Give it a kudos by clicking the Thumbs Up!

DAX is for Analysis. Power Query is for Data Modeling


Proud to be a Super User!

MCSA: BI Reporting

View solution in original post

3 REPLIES 3
edhans
Super User
Super User

The following formula in a new column will generate all dates between the start and end date. 

List.Dates([Start], Duration.Days([End] - [Start]), #duration(1,0,0,0))

Then expand to new rows.

edhans_0-1677716003108.png

becomes this:

edhans_1-1677716061483.png

 

Full code sample:

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45W8spPVdJRMtQ31DcyMDKAM41BTAM9U6VYnWil4MRcsIQpSI0hRI0BiG0EYivFxgIA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Name = _t, Start = _t, End = _t, Pension = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Start", type date}, {"End", type date}}),
    #"Added Date LIst" = Table.AddColumn(#"Changed Type", "Date List", each List.Dates([Start], Duration.Days([End] - [Start]), #duration(1,0,0,0))),
    #"Expanded Date List" = Table.ExpandListColumn(#"Added Date LIst", "Date List")
in
    #"Expanded Date List"

How to use M code provided in a blank query:
1) In Power Query, select New Source, then Blank Query
2) On the Home ribbon, select "Advanced Editor" button
3) Remove everything you see, then paste the M code I've given you in that box.
4) Press Done
5) See this article if you need help using this M code in your model.

 

If that isn't what you need, provide a clearer explanation per info below.

 

How to get good help fast. Help us help you.

How To Ask A Technical Question If you Really Want An Answer

How to Get Your Question Answered Quickly - Give us a good and concise explanation
How to provide sample data in the Power BI Forum - Provide data in a table format per the link, or share an Excel/CSV file via OneDrive, Dropbox, etc.. Provide expected output using a screenshot of Excel or other image. Do not provide a screenshot of the source data. I cannot paste an image into Power BI tables.



Did I answer your question? Mark my post as a solution!
Did my answers help arrive at a solution? Give it a kudos by clicking the Thumbs Up!

DAX is for Analysis. Power Query is for Data Modeling


Proud to be a Super User!

MCSA: BI Reporting

Thank you very much! Awesome!

Glad I could help @Reto_Swiss 



Did I answer your question? Mark my post as a solution!
Did my answers help arrive at a solution? Give it a kudos by clicking the Thumbs Up!

DAX is for Analysis. Power Query is for Data Modeling


Proud to be a Super User!

MCSA: BI Reporting

Helpful resources

Announcements
RTI Forums Carousel3

New forum boards available in Real-Time Intelligence.

Ask questions in Eventhouse and KQL, Eventstream, and Reflex.

MayPowerBICarousel

Power BI Monthly Update - May 2024

Check out the May 2024 Power BI update to learn about new features.

LearnSurvey

Fabric certifications survey

Certification feedback opportunity for the community.

Top Solution Authors
Top Kudoed Authors