SQL - INNER JOIN
Which SQL keyword is essential to perform a self join?
Which SQL keyword is essential to perform a self join?
easy📝 Conceptual Q2 of 15
Step-by-Step Solution
Solution:
Step 1: Identify the keyword used for joining tables
JOIN is the keyword used to combine rows from two or more tables based on a related column.Step 2: Apply to self join context
In self join, JOIN is used to join the table to itself, so JOIN is essential.Final Answer:
JOIN -> Option AQuick Check:
Self join keyword = JOIN [OK]
Quick Trick: Self join always uses JOIN keyword [OK]
Common Mistakes:
MISTAKES- Using GROUP BY instead of JOIN
- Confusing ORDER BY with JOIN
- Using UNION which combines results
Master "INNER JOIN" in SQL
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