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What is the main purpose of using an INNER JOIN in SQL?

easy📝 Conceptual Q1 of 15
SQL - INNER JOIN
What is the main purpose of using an INNER JOIN in SQL?
ATo return all rows from the right table regardless of matches
BTo combine rows from two tables where the join condition is met
CTo return all rows from the left table regardless of matches
DTo delete rows from both tables
Step-by-Step Solution
Solution:

  1. Step 1: Understand INNER JOIN behavior

    INNER JOIN returns rows only when there is a match in both tables based on the join condition.

  2. Step 2: Compare options with INNER JOIN definition

    Only To combine rows from two tables where the join condition is met correctly describes this behavior; others describe LEFT JOIN, RIGHT JOIN, or unrelated actions.

  3. Final Answer:

    To combine rows from two tables where the join condition is met -> Option B

  4. Quick Check:

    INNER JOIN purpose = combine matching rows [OK]
Quick Trick: INNER JOIN returns only matching rows from both tables [OK]
Common Mistakes:
MISTAKES
  • Confusing INNER JOIN with LEFT or RIGHT JOIN
  • Thinking INNER JOIN returns unmatched rows
  • Assuming INNER JOIN deletes data

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