DataFrame in Nested Loop

New to Julia
2

It seems to work here:

julia> using DataFrames

julia> df = DataFrame()
0×0 DataFrame


julia> for year in 1993:2020, month in 1:12
           append!(df,DataFrame(A=year,B=month))
       end

julia> df
336×2 DataFrame
│ Row │ A     │ B     │
│     │ Int64 │ Int64 │
├─────┼───────┼───────┤
│ 1   │ 1993  │ 1     │
│ 2   │ 1993  │ 2     │
│ 3   │ 1993  │ 3     │
│ 4   │ 1993  │ 4     │
│ 5   │ 1993  │ 5     │
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