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What is a key characteristic of a one-to-one relationship in database design?

easy📝 Conceptual Q11 of 15
SQL - Table Relationships
What is a key characteristic of a one-to-one relationship in database design?
AEach row in one table matches exactly one row in another table
BEach row in one table can match many rows in another table
CRows in both tables have no connection
DOne table contains all data without links
Step-by-Step Solution
Solution:

  1. Step 1: Understand one-to-one relationship meaning

    A one-to-one relationship means each record in one table corresponds to exactly one record in another table.

  2. Step 2: Compare options to definition

    Each row in one table matches exactly one row in another table matches this definition perfectly, while others describe different relationships or no relationship.

  3. Final Answer:

    Each row in one table matches exactly one row in another table -> Option A

  4. Quick Check:

    One-to-one = single matching row [OK]
Quick Trick: One-to-one means one row links to exactly one row [OK]
Common Mistakes:
MISTAKES
  • Confusing one-to-one with one-to-many
  • Thinking tables have no relation
  • Assuming one table holds all data

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