Quote: relations, joins, and group-by deliberately ignore the notion of order; called "area", "bundling", and "glumping"

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Introducing areas [c.f., relation] gave us a concept analogous … [c.f., join] gave us functions similar to matching; and glumping [c.f., group by] gave us a way of handling operations such as summarizing … since it was not necessary.   Google-1   Google-2

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