SQL - LEFT and RIGHT JOIN
Which SQL clause is used to include all rows from the left table even if there is no match in the right table?
Which SQL clause is used to include all rows from the left table 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
INNER JOIN returns only matching rows; RIGHT JOIN includes all right table rows; FULL JOIN includes all rows from both tables.Step 2: Identify LEFT JOIN role
LEFT JOIN includes all rows from the left table, even if no match exists in the right table.Final Answer:
LEFT JOIN -> Option CQuick Check:
Include all left rows = LEFT JOIN [OK]
Quick Trick: LEFT JOIN keeps all left rows regardless of right table matches [OK]
Common Mistakes:
MISTAKES- Confusing LEFT JOIN with INNER JOIN
- Mixing LEFT JOIN with RIGHT JOIN
- Assuming FULL JOIN is needed for left-only rows
Master "LEFT and RIGHT JOIN" in SQL
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