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

Find everything you need to get certified on Fabric—skills challenges, live sessions, exam prep, role guidance, and more. Get started

Reply
Anonymous
Not applicable

How to use Power Query List.Max for multiple columns?

This thread on the forums shows how to use List.Max on a date column . What I need is to take the List.Max, not just for one column, but for values across 3 different columns. Can this be done?

 

Example data:

Date 1Date 2 Date 3
8/1/208/2/208/3/20
8/4/208/5/208/5/20

 

Objective here is to create a 4th custom column that finds the max date in the rows to the left of it. For the first row of the custom column, we'd have a Max date of 8/3/20

 

Here's what I tried:

 

List.Max(#"Audit Log 2020"[Date 1],
   List.Max(#"Audit Log 2020"[#"Date 2"],
     List.Max(#"Audit Log 2020"[#"Date 3"])
        )
)

 

As can be seen, I'm trying to take the max of 3 different date columns

1 ACCEPTED SOLUTION
AlB
Super User
Super User

Hi @Anonymous 

It would be better to pivot the columns but if you want to do it like this, paste this M code in  a blank query to see the steps. The last one is the relevant one:

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMlTSUTICYmOl2FgA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Date1 = _t, Date2 = _t, Date3 = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Date1", Int64.Type}, {"Date2", Int64.Type}, {"Date3", Int64.Type}}),
    #"Added Custom" = Table.AddColumn(#"Changed Type", "Custom", each List.Max(Record.ToList(_)))
in
    #"Added Custom"

 

Please mark the question solved when done and consider giving kudos if posts are helpful.

Contact me privately for support with any larger-scale BI needs, tutoring, etc.

Cheers 

 

SU18_powerbi_badge

View solution in original post

2 REPLIES 2
AlB
Super User
Super User

Hi @Anonymous 

It would be better to pivot the columns but if you want to do it like this, paste this M code in  a blank query to see the steps. The last one is the relevant one:

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMlTSUTICYmOl2FgA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Date1 = _t, Date2 = _t, Date3 = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Date1", Int64.Type}, {"Date2", Int64.Type}, {"Date3", Int64.Type}}),
    #"Added Custom" = Table.AddColumn(#"Changed Type", "Custom", each List.Max(Record.ToList(_)))
in
    #"Added Custom"

 

Please mark the question solved when done and consider giving kudos if posts are helpful.

Contact me privately for support with any larger-scale BI needs, tutoring, etc.

Cheers 

 

SU18_powerbi_badge

amitchandak
Super User
Super User

@Anonymous , Try like

 

= Table.AddColumn(#"Changed Type", "Custom", each List.Max({[Date 1],[#"Date 2 "],[Date 3]}))

Helpful resources

Announcements
Europe Fabric Conference

Europe’s largest Microsoft Fabric Community Conference

Join the community in Stockholm for expert Microsoft Fabric learning including a very exciting keynote from Arun Ulag, Corporate Vice President, Azure Data.

Power BI Carousel June 2024

Power BI Monthly Update - June 2024

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

PBI_Carousel_NL_June

Fabric Community Update - June 2024

Get the latest Fabric updates from Build 2024, key Skills Challenge voucher deadlines, top blogs, forum posts, and product ideas.

Top Solution Authors