Forum Discussion
How to join two tables which are non unique
Hi All,
I have two tables as shown below and i want to merge them together to do some analysis in Powerbi, original source of the data is excel files. I want to join the table using two columns Dealer_id and Date.
Table 1
| Dealer_id | Date | L_id | Count | Alt_c |
| 2344 | 01/01/2023 | 23 | 2345 | 333 |
| 2344 | 02/01/2023 | 32 | 4234 | 224 |
| 2344 | 03/01/2023 | 22 | 4245 | 3456 |
| 2344 | 04/01/2023 | 44 | 4242 | 243 |
Table 2
| Dealer_id | Date | Sales |
| 2344 | 01/01/2023 | 4500 |
| 2344 | 02/01/2023 | 3499 |
| 2344 | 03/01/2023 | 2133 |
| 2344 | 04/01/2023 | 2344 |
Desired Output
| Dealer_id | Date | L_id | Count | Alt_c | Sales |
| 2344 | 01/01/2023 | 23 | 2345 | 333 | 4500 |
| 2344 | 02/01/2023 | 32 | 4234 | 224 | 3499 |
| 2344 | 03/01/2023 | 22 | 4245 | 3456 | 2133 |
| 2344 | 04/01/2023 | 44 | 4242 | 243 | 2344 |
What i really need from is to get the Sales from table 2 into table 1, i get the desired output in powerquery but when i apply and close Power query and when the data loads i get the following error "Column Dealer_id in table1 contains a duplicate value '2344' and this is not allowed for columns on the one side of a many to one relationship or for columns that are useed as primary key of a table"
PLease advise how i can solve this.
Thanks
- Disable "Auto Detect Relationship" under file settings.
- Before loading data make sure there are no existing relationships.
- You can join 2 table by using DealerID and Date as the Key
let Source = Table.NestedJoin ( Table1, { "Dealer_id", "Date" }, Table2, { "Dealer_id", "Date" }, "Table2", JoinKind.LeftOuter ), ExtractedSales = Table.ExpandTableColumn ( Source, "Table2", { " Sales" }, { " Sales" } ) in ExtractedSales
3 Replies
- AntrikshSharma
Community Champion
- Disable "Auto Detect Relationship" under file settings.
- Before loading data make sure there are no existing relationships.
- You can join 2 table by using DealerID and Date as the Key
let Source = Table.NestedJoin ( Table1, { "Dealer_id", "Date" }, Table2, { "Dealer_id", "Date" }, "Table2", JoinKind.LeftOuter ), ExtractedSales = Table.ExpandTableColumn ( Source, "Table2", { " Sales" }, { " Sales" } ) in ExtractedSalesWorks fine, Thanks Antriksh!
For the uninititated, you have to create a new Query to paste the above code in Advanced editor.
Also, remove the space before {" Sales"} to avoid error.
ronrsnfldSuper User
I cannot reproduce your problem with the information you have provided. How, exactly, did you merge the tables in Power Query?
I merely selected to get data from Excel; selected the file and then the two tables.
In PQ, I selected to merge the two tables to a new query, using a full outer join, and then extracting the Sales column.
If you did something different, please tell us what you did, and supply the M-Code from the Advanced Editor.
