Can foreign key be not unique?

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Tags

  1. #reference
  2. #avoid
  3. #primary
  4. #extension
  5. #pratical
  6. #reason
  7. #including
  8. #however
  9. #table
  10. #foreign
  11. #standard
  12. #columns
  13. #unique
  14. #constraint
  15. #there
  16. #referenced
  17. #allows
  18. #innodb
  19. #advised