SQL - Advanced Joins
Identify the error in this SQL query:
SELECT a.id, b.value FROM tableA a INNER JOIN tableB b ON a.id = b.id WHERE b.value > 100;
Identify the error in this SQL query:
medium📝 Debug Q6 of 15
Step-by-Step Solution
Solution:
Step 1: Check JOIN syntax
The INNER JOIN has a valid ON condition matching a.id and b.id.Step 2: Check WHERE clause
WHERE clause filters rows after join; syntax is correct.Final Answer:
No error, query is valid -> Option BQuick Check:
Valid INNER JOIN with WHERE filter = no error [OK]
Quick Trick: INNER JOIN requires ON condition and valid WHERE filters [OK]
Common Mistakes:
MISTAKES- Thinking WHERE must be inside JOIN
- Assuming INNER JOIN needs different syntax
- Confusing JOIN types with errors
Master "Advanced Joins" in SQL
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