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Vampirtc
Frequent Visitor

Problem merging two tables using LEFT Outer join

I would like to merge two tables without creating duplicates in first table. Second table has duplicated IDs, which is what I need.

 

For example, table 1:
ID  Name
1   XX

2   YX

3   YY
Table 2:

ID  Info
2 c
2 a
4 b
Currently it does

1   XX m

2   YX c

2   YX a

3   YY


What I want:

1   XX m

2   YX c a

3   YY

1 ACCEPTED SOLUTION
v-alq-msft
Community Support
Community Support

Hi, @Vampirtc 

 

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

Table1:

a1.png

 

Table2:

a2.png

 

You may create a new query with the following m codes in 'Advanced Editor'.

 

let
    Source = Table.NestedJoin(Table1, {"ID"}, Table2, {"ID"}, "Data", JoinKind.LeftOuter),
    Custom1 = Table.TransformColumns(Source,{"Data",each Text.Combine([Info]," "),type text})
in
    Custom1

 

 

Result:

a3.png

 

Best Regards

Allan

 

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

View solution in original post

3 REPLIES 3
Vampirtc
Frequent Visitor

Thank you both that solved the problem.

v-alq-msft
Community Support
Community Support

Hi, @Vampirtc 

 

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

Table1:

a1.png

 

Table2:

a2.png

 

You may create a new query with the following m codes in 'Advanced Editor'.

 

let
    Source = Table.NestedJoin(Table1, {"ID"}, Table2, {"ID"}, "Data", JoinKind.LeftOuter),
    Custom1 = Table.TransformColumns(Source,{"Data",each Text.Combine([Info]," "),type text})
in
    Custom1

 

 

Result:

a3.png

 

Best Regards

Allan

 

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

View solution in original post

Jimmy801
Super User III
Super User III

Hello @Vampirtc 

 

the trick here is to no use Table.ExpandTableColumn but use Table.AggregateTableColumn and as a function use Text.Combine.

Table.AggregateTableColumn(Join, "TableB", {{"Info",each Text.Combine(_, " ") , "Info aggregated"}})

 Here the complete code

let
    TableA = let
            Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMlTSUXJ0VIrViVYyAjKdnMBMYyDT2VkpNhYA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [ID = _t, Name = _t]),
            #"Changed Type" = Table.TransformColumnTypes(Source,{{"ID", Int64.Type}, {"Name", type text}})
        in
            #"Changed Type",
    TableB = let
            Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMlTSUUpUitWBsJLALCMgKxnOSgGzjIGsVDgrTSk2FgA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [ID = _t, Info = _t]),
            #"Changed Type" = Table.TransformColumnTypes(Source,{{"ID", Int64.Type}, {"Info", type text}})
        in
            #"Changed Type",
    Join = Table.NestedJoin
    (
        TableA,
        "ID",
        TableB,
        "ID",
        "TableB",
        JoinKind.LeftOuter
    ),
    #"Aggregated TableB" = Table.AggregateTableColumn(Join, "TableB", {{"Info",each Text.Combine(_, " ") , "Info aggregated"}})
in
    #"Aggregated TableB"

this is the output

Jimmy801_0-1616401950603.png

Copy paste this code to the advanced editor in a new blank query to see how the solution works.

If this post helps or solves your problem, please mark it as solution (to help other users find useful content and to acknowledge the work of users that helped you)
Kudoes are nice too

Have fun

Jimmy

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