[Solved] Why does an INNER JOIN exclude rows that do not have matching keys in both tables? — Ans: Because INNER JOIN returns only rows where join condition is true | SQL

SQL - INNER JOIN

Why does an INNER JOIN exclude rows that do not have matching keys in both tables?

ABecause INNER JOIN deletes unmatched rows

BBecause INNER JOIN returns all rows from the first table

CBecause INNER JOIN returns only rows where join condition is true

DBecause INNER JOIN returns all rows from the second table

Step-by-Step Solution

Solution:

Step 1: Understand INNER JOIN filtering
INNER JOIN returns only rows where the join condition matches in both tables.
Step 2: Analyze why unmatched rows are excluded
Rows without matching keys fail the join condition, so they are excluded from the result.
Final Answer:
Because INNER JOIN returns only rows where join condition is true -> Option C
Quick Check:
INNER JOIN filters unmatched rows by join condition [OK]

Quick Trick: INNER JOIN keeps only rows matching join condition [OK]

Common Mistakes:

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Why does an INNER JOIN exclude rows that do not have matching keys in both tables?