cancel
Showing results for 
Search instead for 
Did you mean: 
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
Carousel_PBI_Wave1

2023 Release Wave 1 Plans

Power BI release plans for 2023 release wave 1 describes all new features releasing from April 2023 through September 2023.

Power BI Summit Carousel 2

Global Power BI Training

Make sure you register today for the Power BI Summit 2023. Don't miss all of the great sessions and speakers!

BizApps LATAM 2023

Business Application LATAM Summit 2023

Join the biggest FREE Business Applications Event in LATAM this February.

Power Platform Bootcamp

Global Power Platform Bootcamp

In this bootcamp we will deep-dive into Microsoft’s Power Platform stack with hands-on sessions and labs, delivered to you by experts and community leaders.