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Which normal form eliminates the possibility of data anomalies due to insert, update, or delete operations

Question

Which normal form eliminates the possibility of data anomalies due to insert, update, or delete operations?

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Solution

The Third Normal Form (3NF) eliminates the possibility of data anomalies due to insert, update, or delete operations.

Here are the steps to achieve 3NF:

  1. First Normal Form (1NF): In this step, we eliminate duplicative columns from the same table and create separate tables for each group of related data and identify each row with a unique column or set of columns (the primary key).

  2. Second Normal Form (2NF): In this step, we meet all the rules of the first normal form and remove subsets of data that apply to multiple rows of a table and place them in separate tables. Then, we create relationships between these new tables and their predecessors through the use of foreign keys.

  3. Third Normal Form (3NF): In this step, we meet all the rules of the second normal form and remove columns that are not dependent upon the primary key.

By achieving 3NF, we can avoid data anomalies that can occur due to insert, update, or delete operations.

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