A Level Computer Science OCR Practice Exam

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What does 0NF refer to in database normalization?

A table with multiple related tables
A table with no normalization
A database structure with unique primary keys
A table that contains only necessary fields

The correct answer is: A table with no normalization

0NF, or Zero Normal Form, refers to a table that has not been subject to any normalization process. In this context, a table in 0NF means that the data may contain duplicate entries, and it can have repeating groups or arrays of data within a single field, leading to potential redundancy and inconsistency when storing information. This state is generally the starting point before any normalization steps are applied to improve the structure of the database and eliminate issues related to data anomalies and redundancy. While it is beneficial for a database structure to have unique primary keys and necessary fields, these characteristics represent states achieved after applying normalization processes. Therefore, those choices do not accurately depict what 0NF entails, making the identification of 0NF as a table with no normalization the correct interpretation.