Hello list, I know this may sound weird and I understand that what follows might be considered as out of scope but I'd like your opinions on this.
I've just seen a new comment to FR #1007 and it got me thinking about the SQL concept of primary and secondary key (where the latter is linked to the primary key of another table). Again, this is a pure speculation post. I just wanted your opinions about having such features in R (via data.table) Thanks, Michele. <http://www.evolve-analytics.com>
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