Row with min value within a category

[sudershan]

Hi,

I have the following data:

S.No.	Txn Date	Opening Bal.	Txn Amount
1	01-Jan-2022	100	1000
2	01-Jan-2022	1100	500
3	02-Jan-2022	1600	800
4	02-Jan-2022	2400	-300
5	03-Jan-2022	2100	750

I need to get the row with min of S.No. for each category of Txn Date.  Or I need to get the Opening Bal. for each Txn Date in a separate query.

I tried Group By by Txn Date with Min of S.No.  but this does not give me the Opening Bal.

Thanks

[Vijay_A_Verma · Accepted solution]

See the working here - Open a blank query - Home - Advanced Editor - Remove everything from there and paste the below code to test (later on when you use the query on your dataset, you will have to change the source appropriately. If you have columns other than these, then delete Changed type step and do a Changed type for complete table from UI again)

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMlTSUTLU9UrM0zUyAjENDCCkgVKsTrSSEZosRNoUKmsMZBshyZqBZS2gsiaoskYmYFldY6i0KZBjjCQNMdrcFCgbCwA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [#"S.No." = _t, #"Txn Date" = _t, #"Opening Bal." = _t, #"Txn Amount" = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"S.No.", Int64.Type}, {"Txn Date", type date}, {"Opening Bal.", Int64.Type}, {"Txn Amount", Int64.Type}}),
    #"Grouped Rows" = Table.Group(#"Changed Type", {"Txn Date"}, {{"S.No.", each List.Min([#"S.No."]), type nullable number}}),
    #"Merged Queries" = Table.NestedJoin(#"Grouped Rows", {"S.No."}, #"Changed Type", {"S.No."}, "Grouped Rows", JoinKind.LeftOuter),
    #"Expanded Grouped Rows" = Table.ExpandTableColumn(#"Merged Queries", "Grouped Rows", {"Opening Bal."}, {"Opening Bal."})
in
    #"Expanded Grouped Rows"

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