How to edit row values of a dataframe column based on condition using query.jl

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Please make sure that you quote your code with triple backticks, and ideally include an MWE with your question.

DataFrames columns can just be treated as vectors so you can broadcast a replace string operation:

julia> using DataFrames

julia> df = DataFrame(CarCompany = rand(["porsche", "porcshce"], 10))

julia> df.CarCompany = replace.(df.CarCompany, Ref("porcshce" => "porsche"))

julia> unique(df.CarCompany)
1-element Array{String,1}: 
"porsche"
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