Advanced Database Management System - Tutorials and Notes: 1NF and 2NF Comparison

Search Engine

Please visit, subscribe and share 10 Minutes Lectures in Computer Science

Sunday, 25 May 2014

1NF and 2NF Comparison

Difference between 1NF and 2NF / Comparison of 1NF and 2NF / Compare 1NF and 2NF / 1NF and 2NF Comparison / 1NF and 2NF difference

Properties to be satisfied for 1NF and 2NF (recall)

1NF – All attribute values are atomic values, i.e, no repeating group or no composite attributes present.
2NF – Table should be in 1NF and no partial functional dependency presents.

Attribute Domain
Should be Atomic
Should be Atomic
Functional Dependencies Identification
Not necessary
Handling of Update Anomalies
Does not handle. It deals with the basic structure of a relation.
Handle update anomalies.
Composite Key as Primary Key
Primary Key can be Composite key
Primary Key cannot be Composite key always. It may violate 2NF if partial key dependency exists. That is, no partial functional dependency is permitted
Eliminate Redundant Data
Ensure Data Dependencies


Related Links

Compare first normal form 1nf with second normal form 2nf in dbms

Featured Content

Multiple choice questions in Natural Language Processing Home

MCQ in Natural Language Processing, Quiz questions with answers in NLP, Top interview questions in NLP with answers Multiple Choice Que...

All time most popular contents