Hello everyone, I’d just spent 5 hours on a simple issue with joining two dataframes. I’ve basically two dataframes, one with a column of sectors and value, the other with new sectors mapped to the previous one as well as weights associated. My issue is that I can’t perform leftjoin on the column…

you need to convert these columns to Vector because you have duplicates.

you could add ;makeunique=true to the join call and see which columns clash

Unfortunately it can’t help, I still have the same issue using makeunique = true. Indeed, this could help if the issue was about column names, but it isn’t. It seems that duplicated keys for merging aren’t allowed. I can see it by using leftjoin(df, df_2, on = :sector, validate = (true, true)) w…

Can you please show a full stack trace. This is an error not in DataFrames.jl, but in the package that provides vectors for your columns. Most likely some of your columns come from https://github.com/davidavdav/NamedArrays.jl and this causes an error (such columns do not allow for duplicate rows).

You’re right! Some of my columns come from a NamedArray initially. Here is indeed a MWE giving the error message I have: using DataFrames using NamedArrays initial = NamedArray([5748.61], ["AUT-A01"]) df_initial = DataFrame(:sector => names(initial,1), :value => initial[:,1]) df_weights = DataFr…

Thank you so much! For those wondering, this is the solution with the MWE thanks to @bkamins : using DataFrames using NamedArrays initial = NamedArray([5748.61], ["AUT-A01"]) df_initial = DataFrame(:sector => vec(names(initial,1)), :value => vec(initial[:,1])) df_weights = DataFrame(sector = ["AU…

DataFrame: Cannot have duplicated names for indices

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DataFrame: Cannot have duplicated names for indices

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