Quote: joins match symbols (e.g., employee number) instead of entities (e.g., an employee)

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But even if there is some attempt to … [domains for joining] … I have never seen a relational domain for … number, or person name, or Julian date, or … of common entities, but only on the basis …   Google-1   Google-2

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Topic: database queries, joins, and relational algebra (33 items)