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  • $\begingroup$ thank you for this answer. I have few follow up questions: Query[All, DeleteMissing] @ d1 still has one c->Missing why? Could you maybe elaborate on the depth for Query? and while this is not directly related, the where the end definition for a pure function needs to go, especially if there might be nested pure functions? $\endgroup$ Commented Oct 21, 2016 at 5:49
  • $\begingroup$ See my edits. I'm not sure whether my additions concerning & fully address your question about pure functions... let me know. $\endgroup$ Commented Oct 21, 2016 at 14:47