Order (count) based on distinct ID

[chris12345]

Hi all,

I am quite new to the Power Query Editor. I've been trying to add an order/count based on an distinct ID like the example below.

ID |  ORDER |

1   |     1       |

1   |     2       |

1   |     3       |

2   |     1       |

2   |     2       |

3   |     1       |

3   |     2       | 

3   |     3       |

3   |     4       |

So I'd like to create column 2 (ORDER). I've been trying myself, but I am still quite unfamaliar with this language and having a bit of a hard time to solve this one. Also I was unable to find it in other topics. In Excel I was able to achieve it via the countif statement, but my dataset is too large to handle it via excel.

[edhans · Accepted solution]

See if this works @chris12345 

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMlSK1UEljZBIY2xkLAA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [ID = _t]),
    #"Grouped Rows" = 
        Table.Group(
            Source, 
            {"ID"}, 
            {
                {"Order", each Table.AddIndexColumn(_, "Order", 1, 1, Int64.Type)}
            }
    ),
    #"Expanded Order" = Table.ExpandTableColumn(#"Grouped Rows", "Order", {"Order"}, {"Order"}),
    #"Changed Type" = Table.TransformColumnTypes(#"Expanded Order",{{"Order", Int64.Type}})
in
    #"Changed Type"

It returns this.

How to use M code provided in a blank query:
1) In Power Query, select New Source, then Blank Query
2) On the Home ribbon, select "Advanced Editor" button
3) Remove everything you see, then paste the M code I've given you in that box.
4) Press Done
5) See this article if you need help using this M code in your model.

[v-alq-msft · Accepted solution]

Hi, @chris12345 

Based on your description, I created data to reproduce your sceanrio. The pbix file is attached in the end.

Table:

You may apply the following transformations in Power Query. Here are the m codes in 'Advanced Editor'.

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMlSK1UEljZBIY2xkLAA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [ID = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"ID", Int64.Type}}),
    Custom1 = Table.Group(#"Changed Type",{"ID"},{"Order",(x)=> List.Generate(
    ()=>1,
    each _<=Table.RowCount(x),
    each _+1
   ) 
   }
),
    #"Expanded Order" = Table.ExpandListColumn(Custom1, "Order"),
    #"Changed Type1" = Table.TransformColumnTypes(#"Expanded Order",{{"Order", Int64.Type}})
in
    #"Changed Type1"

Result:

Best Regards
Allan

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

[edhans · Accepted solution]

See if this works @chris12345 

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMlSK1UEljZBIY2xkLAA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [ID = _t]),
    #"Grouped Rows" = 
        Table.Group(
            Source, 
            {"ID"}, 
            {
                {"Order", each Table.AddIndexColumn(_, "Order", 1, 1, Int64.Type)}
            }
    ),
    #"Expanded Order" = Table.ExpandTableColumn(#"Grouped Rows", "Order", {"Order"}, {"Order"}),
    #"Changed Type" = Table.TransformColumnTypes(#"Expanded Order",{{"Order", Int64.Type}})
in
    #"Changed Type"

It returns this.

How to use M code provided in a blank query:
1) In Power Query, select New Source, then Blank Query
2) On the Home ribbon, select "Advanced Editor" button
3) Remove everything you see, then paste the M code I've given you in that box.
4) Press Done
5) See this article if you need help using this M code in your model.