Error in merging two tables

[quibtisa]

I am having trouble merging two tables in Power Query. I have one table called "Orders" with columns "OrderID", "CustomerID", and "TotalPrice", and another table called "Customers" with columns "CustomerID", "FirstName", and "LastName". I want to merge these two tables on the "CustomerID" column, but I am unsure of how to do this.

Here is the code I have tried:

let
    Source = Table.NestedJoin(Orders,{"CustomerID"},Customers,{"CustomerID"},"NewColumn",JoinKind.Inner),
    #"Expanded NewColumn" = Table.ExpandTableColumn(Source, "NewColumn", {"FirstName", "LastName"}, {"FirstName", "LastName"})
in
    #"Expanded NewColumn"

This code returns an error message saying "The column 'CustomerID' of the table wasn't found." Can someone help me?

[Idrissshatila · Accepted solution]

Hello @quibtisa ,

Check the column name is the same and check if it differs in which if there's a capital letter or a small letter because it matters.

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