Relational Database Design and Modeling for Software Engineers

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First Normal Form (1NF)

The First Normal Form (1NF) is the first step in the normalization process. It enforces the rule that each attribute in a table should contain only atomic (indivisible) values, ensuring that there are no repeating groups or arrays within a column. In other words, 1NF requires that each cell in a table contains only a single value, and each row represents a unique record.

Requirements of 1NF

To satisfy the requirements of 1NF:

  1. Each column should contain only atomic values (no arrays or lists).
  2. Each column should store values of a single data type. 3

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J

jcd3nt0n

· 3 days ago

This article is factually incorrect in multiple places and feels very poorly reviewed for a paid course. It says 1NF requires all entries in a column to be unique, which is false; non-key values can repeat, while uniqueness applies to a candidate key identifying each row. It also claims 1NF reduces redundancy, even though its own examples duplicate student data across rows. On top of that, the first “normalized” example simply drops the Course column from the original table, losing information entirely. These are foundational database concepts, so this level of inaccuracy is concerning.