SQL - Table Relationships
Why is it important to use the same primary key value in both tables when designing a strict one-to-one relationship?
Why is it important to use the same primary key value in both tables when designing a strict one-to-one relationship?
hard📝 Conceptual Q10 of 15
Step-by-Step Solution
Solution:
Step 1: Understand the role of primary keys in one-to-one relationships
Using the same primary key value in both tables tightly links records one-to-one.Step 2: Explain the importance
This design guarantees that each record in one table matches exactly one record in the other, preventing duplicates or missing links.Final Answer:
It ensures each record in one table corresponds exactly to one record in the other -> Option AQuick Check:
Same PK enforces exact one-to-one mapping [OK]
Quick Trick: Same PK in both tables enforces strict one-to-one [OK]
Common Mistakes:
MISTAKES- Thinking it allows many-to-one relationships
- Assuming it removes need for foreign keys
- Believing it improves performance only
Master "Table Relationships" in SQL
Want More Practice?
15+ quiz questions · All difficulty levels · Free
Free Signup - Practice All QuestionsMore SQL Quizzes