R : How to do an X[Y] data.table join, without losing an existing main key on X?

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R : How to do an X[Y] data.table join, without losing an existing main key on X?
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R : How to do an X[Y] data.table join, without losing an existing main key on X?
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How data.table to main an X? do X[Y] an losing on existing join, without : key R



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