Filter a number when missing values are in column

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There are a lot of answers in this thread already that tell you how to do it, e.g.:

julia> df[coalesce.(df.a .!= 5, true), :]
4×2 DataFrame
 Row │ a        b     
     │ Int64?   Int64 
─────┼────────────────
   1 │       3      1
   2 │       6      3
   3 │       0      4
   4 │ missing      5

or

julia> df[.!isequal.(df.a, 5), :]
4×2 DataFrame
 Row │ a        b     
     │ Int64?   Int64 
─────┼────────────────
   1 │       3      1
   2 │       6      3
   3 │       0      4
   4 │ missing      5
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