SQL - Advanced Joins
Which join type returns all rows from the left table and matching rows from the right table, including unmatched rows with NULLs?
Which join type returns all rows from the left table and matching rows from the right table, including unmatched rows with NULLs?
easy📝 Conceptual Q2 of 15
Step-by-Step Solution
Solution:
Step 1: Recall LEFT JOIN behavior
LEFT JOIN returns all rows from the left table and matching rows from the right table; unmatched right rows show NULL.Step 2: Compare with other joins
INNER JOIN returns only matching rows; RIGHT JOIN returns all right rows; FULL OUTER JOIN returns all rows from both tables.Final Answer:
LEFT JOIN -> Option AQuick Check:
LEFT JOIN returns all left rows + matches [OK]
Quick Trick: LEFT JOIN keeps all left table rows, fills NULL if no match [OK]
Common Mistakes:
MISTAKES- Mixing LEFT JOIN with INNER JOIN
- Confusing RIGHT JOIN with LEFT JOIN
- Assuming FULL OUTER JOIN behaves like LEFT JOIN
Master "Advanced Joins" in SQL
Want More Practice?
15+ quiz questions · All difficulty levels · Free
Free Signup - Practice All QuestionsMore SQL Quizzes