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What is the primary benefit of using a JOIN between two tables where one table's primary key matches the other's foreign key?

easy📝 Conceptual Q1 of 15
SQL - INNER JOIN
What is the primary benefit of using a JOIN between two tables where one table's primary key matches the other's foreign key?
AIt deletes duplicate rows from both tables
BIt combines related records from both tables based on the key relationship
CIt creates a new table with only the primary key column
DIt sorts the tables alphabetically by the foreign key
Step-by-Step Solution
Solution:

  1. Step 1: Understand the key relationship

    Primary key uniquely identifies records in one table; foreign key references it in another.

  2. Step 2: Purpose of JOIN

    Joining on these keys combines related rows, enabling retrieval of connected data.

  3. Final Answer:

    It combines related records from both tables based on the key relationship -> Option B

  4. Quick Check:

    Joining merges related data, not deletes or sorts [OK]
Quick Trick: Join keys to combine related data [OK]
Common Mistakes:
MISTAKES
  • Thinking JOIN deletes data
  • Assuming JOIN creates new tables
  • Confusing sorting with joining

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