How to relate Id with column in 2 tables

[cgkas]

Hello to all,

I have this table #1 with columns "Month" and corresponding "Id"

Id	Month
1	Jan
2	Feb
3	Mar

And this table #2 with columns "Visitors", "Day" and "Month"

Visitors	Day	Month
100	4	Feb
135	7	Feb
400	23	Feb
900	8	Jan
123	21	Jan
342	27	Jan
782	29	Jan
322	11	Mar
134	19	Mar

I want to have a new column in Table #2 with the corresponding "Id" for each month and show sorted by "Id" and then by "Day" like below:

Id	Visitors	Day	Month
1	900	8	Jan
1	123	21	Jan
1	342	27	Jan
1	782	29	Jan
2	100	4	Feb
2	135	7	Feb
2	400	23	Feb
3	322	11	Mar
3	134	19	Mar

May someone help me to do this please.

[v-xuding-msft · Accepted solution]

Hi @cgkas ,

@HotChilli , His method is worked and convenient.  If you want to implement in Power Query. There is a way you can have a try.

1.Choose Home --> Merge Queries --> choose Left Outer

2.Append the table

3.Reordered column Table1.Id and removed the column Table1.Month . Then you can get the table you want.

let
Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMjQwUNJRMgFit9QkpVgdoIixKZBnjiRiAlZjZIwkZAkWsgBir8Q8iDawvJEhkpCxiRFIyBxJyNwCLGSJrMoIJGQI0uibWAR1AshBhpYwoVgA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type text) meta [Serialized.Text = true]) in type table [Visitors = _t, Day = _t, Month = _t]),
#"Changed Type" = Table.TransformColumnTypes(Source,{{"Visitors", Int64.Type}, {"Day", Int64.Type}, {"Month", type text}}),
#"Merged Queries" = Table.NestedJoin(#"Changed Type", {"Month"}, Table1, {"Month"}, "Table1", JoinKind.LeftOuter),
#"Expanded Table1" = Table.ExpandTableColumn(#"Merged Queries", "Table1", {"Id", "Month"}, {"Table1.Id", "Table1.Month"}),
#"Reordered Columns" = Table.ReorderColumns(#"Expanded Table1",{"Table1.Id", "Visitors", "Day", "Month", "Table1.Month"}),
#"Sorted Rows" = Table.Sort(#"Reordered Columns",{{"Table1.Id", Order.Ascending}}),
#"Removed Columns" = Table.RemoveColumns(#"Sorted Rows",{"Table1.Month"})
in
#"Removed Columns"

Best Regards,

Xue Ding

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

[HotChilli]

You need a relationship on Month (it should create automatically)

Then create the column in table2 as

Id = RELATED(Table1[Id]) 

[cgkas]

Hi HotChili,

For Table1 I have this code:

let
    Source = Excel.CurrentWorkbook(){[Name="Table1"]}[Content],
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Id", Int64.Type}, {"Month", type text}})
in
    #"Changed Type"

and for Table2 this code:

let
    Source = Excel.CurrentWorkbook(){[Name="Table2"]}[Content],
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Visitors", Int64.Type}, {"Day", Int64.Type}, {"Month", type text}}),
    #"Added Custom" = Table.AddColumn(#"Changed Type", "Id", each RELATED(Table1[Id]))
in
    #"Added Custom"

I added the custim colum but I receive error in #"Added Custom" step.

Expression.Error: The name 'RELATED' wasn't recognized.  Make sure it's spelled correctly.

What is missing and what I´m doing wrong?

Thanks

[HotChilli]

You are in Power Query. 

I wrote you some DAX (which is used in powerbi)