In which normal form are there no repeating groups or arrays?  1 point1NF2NF3NFBCNF

Break Down the Problem

1. Identify the types of normal forms in database normalization.
2. Determine the specific characteristics of each normal form mentioned.

Relevant Concepts

• 1NF (First Normal Form): A relation is in 1NF if it contains only atomic (indivisible) values, which means there are no repeating groups or arrays.
• 2NF (Second Normal Form): A relation is in 2NF if it is in 1NF and all non-key attributes are fully functionally dependent on the primary key.
• 3NF (Third Normal Form): A relation is in 3NF if it is in 2NF and there are no transitive dependencies.
• BCNF (Boyce-Codd Normal Form): A relation is in BCNF if it is in 3NF and every determinant is a candidate key.

Analysis and Detail

1. From the definitions, 1NF specifically addresses the lack of repeating groups or arrays.
2. The other normal forms (2NF, 3NF, BCNF) build upon the conditions of the previous forms, thus they inherently allow for structures that could contain repeating groups or arrays as they are more concerned with dependencies.

Verify and Summarize

After analyzing the definitions:

• 1NF eliminates repeating groups.
• Other forms focus on dependency relationships, assuming the relation satisfies the conditions of 1NF.

Final Answer

The correct answer is 1NF (First Normal Form).