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by LkpPo
60 days ago
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And it's really not the same thing because ids are not position. With this type of structure a field without value will be a missing row in a table. Moreover, from the moment each column is isolated in its own table with a second key column, it becomes essential not to store NULL values because the amount of data doubles for each value, since a primary key is required for each column. It's a 6NF model. See <https://en.wikipedia.org/wiki/Sixth_normal_form> |
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