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-- 1NF: Each cell holds one value; there is a PK -- 2NF: Every non-PK column depends on the whole PK -- 3NF: Every non-PK column depends only on the PK (not other non-PK) -- BCNF: For X->Y, X must be a superkey -- 4NF: No multi-valued dependencies -- 5NF: No join dependencies -- Most real databases target 3NF or BCNF
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