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2.1.19. 2y and 3y joins

  • Queries can encapsulate any number of relations
    • Even one relation many times (in different roles)
  • Relationship chain
  • Across many relations
    • Tuples as Entities OR Relationships
  • e.g. Employee -> Works_on -> Project -> Department ->
    Manager
‹ 2.1.18c. Outer joins (cont)up2.1.20. Recursive closure ›
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