How to merge 2 dataframes (DataFrames.jl)

General Usage
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3

I agree with the above, although it seems to me like you are just trying to vertically concatenate the DataFrames rather than join them?

julia> vcat(test1, test2, cols = :union)
6×3 DataFrame
 Row │ ID     Name    Argh      
     │ Int64  String  Float64?  
─────┼──────────────────────────
   1 │     1  A             5.0
   2 │     2  B            62.1
   3 │     3  C            89.0
   4 │     4  D       missing   
   5 │     5  E       missing   
   6 │     6  F       missing

(note the cols = :union argument which fills in the missing Argh column in test2 with missing)

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