What is normalization? Explain 1NF and 2NF.
Understand the Problem
The question is asking for an explanation of the concept of normalization in the context of database design, specifically referencing the first normal form (1NF) and the second normal form (2NF). This involves defining what normalization is and explaining how 1NF and 2NF are applied in organizing data in relational databases.
Answer
Normalization reduces data redundancy. 1NF ensures tables have unique rows and atomic values. 2NF ensures tables are in 1NF and non-key attributes depend entirely on the primary key.
Normalization is a process in database design used to minimize redundancy and ensure data integrity. The First Normal Form (1NF) requires that the data is stored in tables with unique rows and atomic values (no repeating groups or columns). The Second Normal Form (2NF) requires that the table is in 1NF and that all non-key attributes are fully functionally dependent on the primary key, which removes any partial dependencies.
Answer for screen readers
Normalization is a process in database design used to minimize redundancy and ensure data integrity. The First Normal Form (1NF) requires that the data is stored in tables with unique rows and atomic values (no repeating groups or columns). The Second Normal Form (2NF) requires that the table is in 1NF and that all non-key attributes are fully functionally dependent on the primary key, which removes any partial dependencies.
More Information
Normalization helps maintain database integrity by organizing and structuring data, which supports efficient data management.
Tips
A common mistake is overlooking the need for atomic values in 1NF, or not fully understanding functional dependency for 2NF.
Sources
- DBMS Normalization: 1NF, 2NF, 3NF and BCNF with Examples - javatpoint.com
- Database Normalization – Normal Forms 1nf 2nf 3nf Table Examples - freecodecamp.org
- Difference Between 1NF and 2NF in DBMS - GeeksforGeeks - geeksforgeeks.org
