Creating index by group column power query

[twister8889]

Hi guys,

I need to join two tables by one field, and I would like to do this using one number field, not string.

Table1

ID	Attribute	Value	ExpectedIDTable1
StringtoID1	Customer	Customer1	1
StringtoID1	Product	Prduct1	1
StringtoID2	Customer	Customer2	2
StringtoID2	Product	Product2	2

Table2

IDTable1	Value	ExpectedIDTable1
StringtoID1	200	1
StringtoID2	300	2

I need to join Table1 and Table2, but I would like to create a column as number index to replace the "StringtoID" values. How do I do the ExpectedIDTable1 on Table1 and Table2?

[v-kelly-msft]

Hi  @twister8889 ,

If all the ID columns are as you show,you could also use below M codes:

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WCi4pysxLL8n3dDFU0lFyLi0uyc9NLUJiGirF6qArCyjKTylNLgGzQAx0NUbYjTLCogzZKDALqCgWAA==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [ID = _t, Attribute = _t, Value = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"ID", type text}, {"Attribute", type text}, {"Value", type text}}),
    #"Added Custom" = Table.AddColumn(#"Changed Type", "Custom", each [ID]),
    #"Replaced Value" = Table.ReplaceValue(#"Added Custom","StringtoID"," ",Replacer.ReplaceText,{"Custom"}),
    #"Trimmed Text" = Table.TransformColumns(#"Replaced Value",{{"Custom", Text.Trim, type text}}),
    #"Changed Type1" = Table.TransformColumnTypes(#"Trimmed Text",{{"Custom", Int64.Type}})
in
    #"Changed Type1"

And you will see:

For the related .pbix file,pls see attached.

Best Regards,
Kelly

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[Greg_Deckler · Accepted solution]

@twister8889 Perhaps:

Table (1)

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WCi4pysxLL8n3dDFU0lFyLi0uyc9NLUJiGirF6qArCyjKTylNLgGzQAx0NUbYjTLCogzZKDALqCgWAA==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [ID = _t, Attribute = _t, Value = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"ID", type text}, {"Attribute", type text}, {"Value", type text}}),
    #"Added Index" = Table.AddIndexColumn(#"Changed Type", "Index", 1, 1, Int64.Type),
    #"Grouped Rows" = Table.Group(#"Added Index", {"ID"}, {{"Min", each List.Min([Index]), type number}, {"Table", each _, type table [ID=nullable text, Attribute=nullable text, Value=nullable text, Index=number]}}),
    #"Added Index1" = Table.AddIndexColumn(#"Grouped Rows", "Index", 1, 1, Int64.Type),
    #"Expanded Table" = Table.ExpandTableColumn(#"Added Index1", "Table", {"Attribute", "Value"}, {"Table.Attribute", "Table.Value"}),
    #"Removed Columns" = Table.RemoveColumns(#"Expanded Table",{"Min"})
in
    #"Removed Columns"

Table (2)

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WCi4pysxLL8n3dDFU0lEyMjBQitVBFjUCihqDRGMB", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [IDTable1 = _t, Value = _t]),
    #"Added Index" = Table.AddIndexColumn(Source, "Index", 1, 1, Int64.Type)
in
    #"Added Index"