Merged queries with deleted duplicates and filtered rows

Hi EtienneT ,
Thanks for PwerQueryKees reply.
Not sure about the structure of your second table based on your description, here's my test data
Table 2

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WcnRyVtJRMjQwAJGmINLAXN/IWN/IwMhEKVYHrsAQrMAMpsAEQ4ExSMpP3xGqwAyqIBYA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [ID = _t, Data_1 = _t, Data_2 = _t, Date_Field = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"ID", type text}, {"Data_1", Int64.Type}, {"Data_2", type text}, {"Date_Field", type date}}),
    SortedTable = Table.Sort(Source,{{"ID", Order.Ascending}, {"Date_Field", Order.Descending}}),
    AddIndex = Table.AddIndexColumn(SortedTable, "Index", 1, 1, Int64.Type),
    GroupedTable = Table.Group(AddIndex, {"ID"}, {
        {"LatestData", each 
            let
                LatestData1 = List.First([Data_1]),
                LatestData2 = if List.First([Data_2]) <> "N/A" then List.First([Data_2]) else List.First(List.Skip([Data_2], 1))
            in
                [Data_1 = LatestData1, Data_2 = LatestData2]
        }
    }),
    ExpandedTable = Table.ExpandRecordColumn(GroupedTable, "LatestData", {"Data_1", "Data_2"}),
    #"Merged Queries" = Table.NestedJoin(ExpandedTable, {"ID"}, #"Table (2)", {"ID"}, "Table (2)", JoinKind.LeftOuter),
    #"Expanded Table (2)" = Table.ExpandTableColumn(#"Merged Queries", "Table (2)", {"Other data"}, {"Table (2).Other data"})
in
    #"Expanded Table (2)"

Final output

Best regards,
Albert He

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