I have read your article in the link.
For me, I would pick :
Rust instead of R. I am learning it, in parallel with Golang; when I get bored learning Golang, I switch to Rust. :)
C# instead of SQL, because any developer who wants to work on RDBMS must know SQL. Unfortunately, currently I don't have time to learn C#. The language needs .Net; both technologies are massive to learn.
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I have read your article in the link.
For me, I would pick :