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Which of the following best describes the Second Normal Form (2NF) in database design?

easy📝 Conceptual Q11 of 15
SQL - Database Design and Normalization
Which of the following best describes the Second Normal Form (2NF) in database design?
AIt removes partial dependencies on a part of a composite key.
BIt eliminates all transitive dependencies.
CIt requires that all columns be atomic.
DIt allows duplicate rows in a table.
Step-by-Step Solution
Solution:

  1. Step 1: Understand 2NF definition

    2NF requires that no non-key attribute depends on only part of a composite primary key.

  2. Step 2: Compare options with 2NF

    'It removes partial dependencies on a part of a composite key.' correctly states this. 'It eliminates all transitive dependencies.' describes 3NF. 'It requires that all columns be atomic.' describes 1NF, and 'It allows duplicate rows in a table.' is incorrect.

  3. Final Answer:

    It removes partial dependencies on a part of a composite key. -> Option A

  4. Quick Check:

    2NF = Remove partial dependencies [OK]
Quick Trick: 2NF fixes partial dependencies on composite keys [OK]
Common Mistakes:
  • Confusing 2NF with 3NF
  • Thinking 2NF removes all duplicates
  • Believing 2NF requires atomic columns

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