To be pedantic, is not a contradiction. Is a sign of problem with the design? Probably! Most likely! But the relational model CAN'T say it. The normal forms ar

To be pedantic, is not a contradiction. Is a sign of problem with the design? Probably! Most likely! But the relational model CAN'T say it. The normal forms are properties of the way you can do the design, but can't go that Deep. In other words: You can adhere 100% on SOLID OOP principles and your code is still conceptually wrong! If pay attention to the article, his issue is that people latches on the apparent definition of 1st normal form, but misunderstanding it and probably coming to the wrong conclusion about how make the tables...