SQL - INNER JOIN
When performing an INNER JOIN, how does the join engine decide which rows to include in the result?
When performing an INNER JOIN, how does the join engine decide which rows to include in the result?
easy📝 Conceptual Q2 of 15
Step-by-Step Solution
Solution:
Step 1: Understand INNER JOIN behavior
INNER JOIN returns rows only when the join condition matches in both tables.Step 2: Exclude unmatched rows
Rows without matching values in either table are excluded from the result.Final Answer:
It includes only rows where the join condition matches in both tables -> Option BQuick Check:
INNER JOIN = matched rows only [OK]
Quick Trick: INNER JOIN returns only matching rows from both tables [OK]
Common Mistakes:
MISTAKES- Thinking INNER JOIN returns all rows from one table
- Confusing INNER JOIN with OUTER JOIN
- Assuming unmatched rows appear in result
Master "INNER JOIN" in SQL
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