But while the NULLs do not violate 1NF, they do violate the core relational Information Principle (IP), which requires data to be represented in exactly one way--as values in R-tables.
Sunday, September 8, 2013
Allowing Nulls in R-tables
According to Codd a "table with at least one nullable attribute" (Wikipedia) disqualifies it from being 1NF.
http://en.wikipedia.org/wiki/First_normal_form
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