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A comment on What does First Normal Form mean?. Parent comment
Level 1 data science: "We have several data."
Level 100 data science: "A relation have a fixed number of attributes (columns) and each column have a domain [...]."
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Level 1 data science: "We have several data."
Level 100 data science: "A relation have a fixed number of attributes (columns) and each column have a domain [...]."