Power Query last 2 dates

[Anonymous]

Hello,

In Power Query I need to filter my table by the last 2 dates that are available. For example, I have a column "Date of End" with 3 dates :

18/08/2021

04/08/2021

03/08/2021

And I need to see only the rows for the last 2 dates that are : 

18/08/2021

04/08/2021

My table will be growing everyday but the column "Date of end" is not regular (it's not necessarily every 2 weeks).

Thank you for your help!

[v-kelly-msft · Accepted solution]

Hi @Anonymous ,

In power query,you could use below M codes:

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WstA31TcyMDJUitUBcQwtkHkmyBxjKCcWAA==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Date = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Date", type date}}),
    #"Grouped Rows" = Table.Group(#"Changed Type", {"Date"}, {{"End of date", each List.Max([Date]), type nullable date}}),
    #"Added Custom" = Table.AddColumn(#"Grouped Rows", "Custom", each Table.MaxN(#"Grouped Rows","End of date",2)),
    #"Expanded Custom" = Table.ExpandTableColumn(#"Added Custom", "Custom", {"End of date"}, {"Custom.End of date"}),
    #"Added Custom1" = Table.AddColumn(#"Expanded Custom", "Custom", each if [Date]=[Custom.End of date] then [Date] else null),
    #"Filtered Rows" = Table.SelectRows(#"Added Custom1", each [Custom] <> null and [Custom] <> ""),
    #"Removed Columns" = Table.RemoveColumns(#"Filtered Rows",{"End of date", "Custom.End of date"})
in
    #"Removed Columns"

And you will see:

You could also realize it using dax expression:

Create a column as below:

rank = IF( RANKX('Table (2)','Table (2)'[Date],,DESC,Dense)<=2,'Table (2)'[Date],BLANK())

And you will see:

For the related .pbix file,pls see attached.

Best Regards,
Kelly

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[CT2]

This saved me so much time - thanks.

[CNENFRNL]

Simply Table.MaxN() does the trick,

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WclTSUTK00Dew0DcyMDJUitWJVkpJgYghCSUBRUyQBdLQBZycQSYZIQsVg4yBC8QCAA==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Other = _t, #"Date of end" = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Date of end", type date}}, "de"),
    #"Grouped Rows" = Table.Group(#"Changed Type", {"Date of end"}, {{"ar", each _, type table [Other=nullable text, Date of end=nullable date]}}),
    MaxN = Table.MaxN(#"Grouped Rows", "Date of end", 2),
    #"Expanded ar" = Table.ExpandTableColumn(MaxN, "ar", {"Other"}, {"Other"})
in
    #"Expanded ar"

[amitchandak]

@Anonymous , based on what I got, create a column like this and filter for 1

if [Date of End] <= List.Max([Date of End]) && [Date of End] >= (List.Max([Date of End]) -#duration(2,0,0,0)) then 1 else 0