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Re:What does First Normal Form mean? by wcarss on Friday June 18, 2021 @11:44AM (#27551553)
may also be english as a second+ language or just a frequent brainfart around pluralization, see the intro:

> This post explains what 1NF actually means and is useful for, and debunk a number of the misunderstandings.

Re:What does First Normal Form mean? by ehw3 on Friday June 18, 2021 @06:40PM (#27555809)
The Wikipedia entry on First Normal Form also uses this kind of construction, which I suspect means it was written by the same person.

I have never seen terms like domain and attribute used as if they were plurals (the way "data" is), but even were that correct, "a domain have" would be contradictory, so I think it is just a linguistic quirk of the writer.