Shulou(Shulou.com)06/01 Report--

The first paradigm: every field is atomic and every item in the table is inseparable.

The second normal form: first satisfy the first normal form, and the second normal form needs to be satisfied, and the non-primary attribute is completely determined by the primary key. That is, a primary key only determines a row.

The third normal form: satisfy the second normal form, but also satisfy that there is no transitive dependency, to put it simply, the non-primary attributes in one table should not appear in another table.

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