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SafeAnalyst's avatar
SafeAnalyst
Frequent Visitor
5 years ago
Solved

How to Lookup value from latest date for specific value

Hi.   I have the following dataset where i would like to locate the 'Item Legder Entry Type' for each Item No based on the last posting date. I have the column 'Last Posting Date' and i would like ...
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  • Smauro's avatar
    Smauro
    5 years ago

    Hi SafeAnalyst ,

     

    Using [Last Posting Date] :

    let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMrLQNbDUNTIwMlBQ0lFSQAIBpUXJGYnFqUBhVzcDY0tzIANZdaxOtJIBkG8O5sM1+6WmJ5ZklqUqOKZklRaX5KbmleAzwchY18AM1QQ4cM7PKy7NLSjJzM/Da4QJjA+URHW1iYkRSANCAVi9EWnqgWwDQyDX0BIoB/deIpr3TMzNgAwktbGxAA==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [#"Posting Date" = _t, #"Item Ledger Entry Type" = _t, #"Item No" = _t, #"Last Posting Date" = _t]),

    #"Keep Last Dates" = Table.SelectRows(Source, each [Posting Date] = [Last Posting Date])
in
    #"Keep Last Dates"


    Using just [Posting Date] :

    let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMrLQNbDUNTIwMlBQ0lFSQAIBpUXJGYnFqUBhVzcDY0tzIANZdaxOtJIBkG8O5sM1+6WmJ5ZklqUqOKZklRaX5KbmleAzwchY18AM1QQ4cM7PKy7NLSjJzM/Da4QJjA+URHW1iYkRSANCAVi9EWnqgWwDQyDX0BIoB/deIpr3TMzNgAwktbGxAA==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [#"Posting Date" = _t, #"Item Ledger Entry Type" = _t, #"Item No" = _t, #"Last Posting Date" = _t]),

    LastDates = Table.Group(Source[[Item No], [Posting Date]], {"Item No"}, {{"Max Date", each List.Max([Posting Date]), type date}}),
    #"Keep Last Dates" = Table.NestedJoin ( Source, {"Item No", "Posting Date"}, LastDates, {"Item No", "Max Date"}, "Remove", JoinKind.Inner),
    #"Remove Extra Column" = Table.RemoveColumns( #"Keep Last Dates", {"Remove"})
in
    #"Remove Extra Column"
AlB's avatar
AlB
Community Champion
5 years ago

Hi SafeAnalyst 

Paste this code in a blank query to see the steps. #"Filtered Rows" is the relevant one

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMrLQNbDUNTIwMlBQ0lEKKC1KzkgsTgUyXd0MjC3NlWJ1opUMgGrMwWqA4n6p6YklmWWpCo4pWaXFJbmpeSWoqo2MdQ3MYKqd8/OKS3MLSjLz85BUxQIA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [#"Posting Date" = _t, #"Item Ledger Entry Type" = _t, #"Item No" = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Posting Date", type date}, {"Item Ledger Entry Type", type text}, {"Item No", type text}}),

    #"Filtered Rows" = Table.SelectRows(#"Changed Type", each List.Max(#"Changed Type"[Posting Date])=[Posting Date])
in
    #"Filtered Rows"

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 

 

SafeAnalyst's avatar
SafeAnalyst
Frequent Visitor
5 years ago

Thanks AlB - It worked like a charm. I figured it would be quite simple 🙂