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Why is it important to enforce foreign key constraints in a one-to-many relationship?

hard📝 Conceptual Q10 of 15
SQL - Table Relationships
Why is it important to enforce foreign key constraints in a one-to-many relationship?
ATo allow duplicate primary keys in the child table
BTo speed up query performance automatically
CTo ensure data integrity by preventing orphan records
DTo make the database schema more complex
Step-by-Step Solution
Solution:

  1. Step 1: Understand foreign key purpose

    Foreign keys ensure that child records reference valid parent records.

  2. Step 2: Identify importance of data integrity

    This prevents orphan records that have no matching parent, keeping data consistent.

  3. Final Answer:

    To ensure data integrity by preventing orphan records -> Option C

  4. Quick Check:

    Foreign keys maintain data integrity [OK]
Quick Trick: Foreign keys prevent orphan records, keeping data consistent [OK]
Common Mistakes:
MISTAKES
  • Thinking foreign keys improve performance automatically
  • Believing foreign keys allow duplicate primary keys
  • Assuming foreign keys add unnecessary complexity

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