SQL - LEFT and RIGHT JOIN
Which SQL clause ensures that all rows from the left table appear in the result, even if there is no match in the right table?
Which SQL clause ensures that all rows from the left table appear in the result, even if there is no match in the right table?
easy📝 Conceptual Q2 of 15
Step-by-Step Solution
Solution:
Step 1: Recall JOIN types
LEFT JOIN returns all rows from the left table regardless of matches in the right table.Step 2: Match clause to behavior
Only LEFT JOIN guarantees all left rows appear, even without right matches.Final Answer:
LEFT JOIN -> Option AQuick Check:
Clause for all left rows = LEFT JOIN [OK]
Quick Trick: LEFT JOIN preserves all left rows, unmatched right rows are NULL [OK]
Common Mistakes:
MISTAKES- Choosing INNER JOIN which excludes unmatched rows
- Confusing RIGHT JOIN with LEFT JOIN
- Assuming FULL JOIN only preserves left rows
Master "LEFT and RIGHT JOIN" in SQL
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