When in doubt, check the primary source: https://www.seas.upenn.edu/~zives/03f/cis550/codd.pdf https://www.seas.upenn.edu/~zives/03f/cis550/codd.pdf See sectio

When in doubt, check the primary source: https://www.seas.upenn.edu/~zives/03f/cis550/codd.pdf https://www.seas.upenn.edu/~zives/03f/cis550/codd.pdf See section 1.4 about eliminating “non-simple domains” (which means nested tables) through a process of normalization.