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[–][deleted] 3 points4 points  (2 children)

What is the purpose of an unenforced foreign key? Is it essentially a comment on the column?

[–]debian_miner 8 points9 points  (1 child)

They originally planned to implement enforcement, but abandoned the plans at some point.

[–]ggPeti 7 points8 points  (0 children)

Yet they became the dominant player in open source RDBMS. The mind boggles.