Which JOIN returns only the matching rows from both tables? 1 pointINNER JOINLEFT JOINRIGHT JOINFULL OUTER JOIN
Question
Which JOIN returns only the matching rows from both tables?
1 point
- INNER JOIN
- LEFT JOIN
- RIGHT JOIN
- FULL OUTER JOIN
Solution
Breakdown the Problem
- We need to identify the type of SQL JOIN that returns only the matching rows from both tables.
Relevant Concepts
- INNER JOIN: Returns records that have matching values in both tables.
- LEFT JOIN: Returns all records from the left table and the matched records from the right table; unmatched records from the right table will show as NULL.
- RIGHT JOIN: The opposite of LEFT JOIN; it returns all records from the right table and matched records from the left table, with unmatched records showing as NULL.
- FULL OUTER JOIN: Returns all records when there is a match in either left or right table records; unmatched records from both sides will show NULL.
Analysis and Detail
- Only the INNER JOIN will return rows that exist in both tables based on the given condition. Other joins may return additional rows including those without matches.
Verify and Summarize
- By considering the definitions of each JOIN, it's clear that the INNER JOIN is the only type that excludes non-matching rows entirely.
Final Answer
INNER JOIN is the correct answer, as it returns only the matching rows from both tables.
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