List.Min custom column

[Anonymous]

Hello! 

I am struggling to create Column [Min Projected EOH Date] below as a custom Column in M in the same table without changing the rest of the table. 

Actual EOH Tbl	Projected EOH Tbl	Date	Min Projected EOH Date
tbl_ActualEOH	null	3/30/2020	4/27/2020
tbl_ActualEOH	null	3/30/2020	4/27/2020
tbl_ActualEOH	null	3/30/2020	4/27/2020
tbl_ActualEOH	null	4/6/2020	4/27/2020
tbl_ActualEOH	null	4/6/2020	4/27/2020
tbl_ActualEOH	null	4/6/2020	4/27/2020
tbl_ActualEOH	null	4/6/2020	4/27/2020
tbl_ActualEOH	null	4/13/2020	4/27/2020
tbl_ActualEOH	null	4/13/2020	4/27/2020
tbl_ActualEOH	null	4/13/2020	4/27/2020
tbl_ActualEOH	null	4/13/2020	4/27/2020
tbl_ActualEOH	null	4/20/2020	4/27/2020
tbl_ActualEOH	null	4/20/2020	4/27/2020
tbl_ActualEOH	null	4/20/2020	4/27/2020
tbl_ActualEOH	null	4/20/2020	4/27/2020
tbl_ActualEOH	null	4/27/2020	4/27/2020
tbl_ActualEOH	null	4/27/2020	4/27/2020
tbl_ActualEOH	null	4/27/2020	4/27/2020
tbl_ActualEOH	null	4/27/2020	4/27/2020
null	tbl_ProjectEOH	4/27/2020	4/27/2020
null	tbl_ProjectEOH	4/27/2020	4/27/2020
null	tbl_ProjectEOH	4/27/2020	4/27/2020
null	tbl_ProjectEOH	4/27/2020	4/27/2020
null	tbl_ProjectEOH	5/4/2020	4/27/2020
tbl_ActualEOH	null	5/4/2020	4/27/2020
tbl_ActualEOH	null	5/4/2020	4/27/2020
null	tbl_ProjectEOH	5/4/2020	4/27/2020
tbl_ActualEOH	null	5/4/2020	4/27/2020
null	tbl_ProjectEOH	5/4/2020	4/27/2020
null	tbl_ProjectEOH	5/4/2020	4/27/2020
null	tbl_ProjectEOH	5/4/2020	4/27/2020
null	tbl_ProjectEOH	5/4/2020	4/27/2020
null	tbl_ProjectEOH	5/4/2020	4/27/2020
null	tbl_ProjectEOH	5/4/2020	4/27/2020
tbl_ActualEOH	null	5/4/2020	4/27/2020
null	tbl_ProjectEOH	5/11/2020	4/27/2020
null	tbl_ProjectEOH	5/11/2020	4/27/2020
null	tbl_ProjectEOH	5/11/2020	4/27/2020
null	tbl_ProjectEOH	5/11/2020	4/27/2020
null	tbl_ProjectEOH	5/11/2020	4/27/2020
null	tbl_ProjectEOH	5/11/2020	4/27/2020
null	tbl_ProjectEOH	5/11/2020	4/27/2020
null	tbl_ProjectEOH	5/11/2020	4/27/2020
null	tbl_ProjectEOH	5/11/2020	4/27/2020

I have tried to use List.Min however it returns "cannot convert date type to type list" 

Thanks! 

[Greg_Deckler]

So is that the minimum date where "Projected EOH Tbl" is not null then?

[Anonymous]

@Greg_Deckler yes that is correct. 

[Greg_Deckler]

I was able to do this:

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WKknKiXdMLilNzHH191DSUcorzckBUsb6xgb6RgZGBkC2ib6ROYQdqzOAGkz0zYa4ekPjoa/BiNRIG4wazIeMBqgCkL6Aovys1OQSiMbhosNU34SkkKKaepo7iGQLRqQG6oWqoeGojkGvIxYA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type text) meta [Serialized.Text = true]) in type table [#"Actual EOH Tbl" = _t, #"Projected EOH Tbl" = _t, Date = _t, #"Min Projected EOH Date" = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Actual EOH Tbl", type text}, {"Projected EOH Tbl", type text}, {"Date", type date}, {"Min Projected EOH Date", type date}}),
    #"Renamed Columns" = Table.RenameColumns(#"Changed Type",{{"Min Projected EOH Date", "Desired Min Projected EOH Date"}}),
    #"Added Custom" = Table.AddColumn(#"Renamed Columns", "Min Projected EOH Date", each Table.Min(Table.SelectRows(#"Renamed Columns",each ([Projected EOH Tbl] = "tbl_ProjectEOH")), { "Date" })),
    #"Expanded Min Projected EOH Date" = Table.ExpandRecordColumn(#"Added Custom", "Min Projected EOH Date", {"Date"}, {"Min Projected EOH Date.Date"})
in
    #"Expanded Min Projected EOH Date"

[Anonymous]

Thanks so much! I was able to use your code to make it work in my Query! 

#"Added Custom1" = Table.AddColumn(#"Changed Type", "Min Projected EOH Date", each Table.Min(Table.SelectRows(#"Changed Type",each ([Projected EOH Tbl] = "tbl_ProjectEOH")), { "Date" })),
#"Expanded Min Projected EOH Date" = Table.ExpandRecordColumn(#"Added Custom1", "Min Projected EOH Date", {"Date"}, {"Min Projected EOH Date.Date"}),
#"Changed Type1" = Table.TransformColumnTypes(#"Expanded Min Projected EOH Date",{{"Min Projected EOH Date.Date", type date}}),