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Find the error in the provided SQL query.

SQLmedium0.3 min read

Reviewed by Aditya Kumar · Last reviewed 2026-03-24

**Common errors**: (1) Non-aggregated column in SELECT without GROUP BY. (2) Aggregate in WHERE instead of HAVING. (3) Alias in WHERE (not yet evaluated). (4) NULL in NOT IN. (5) Missing join condition = Cartesian. (6) Division by zero. (7) Type mismatch. **Debug**: Isolate...

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Frequency
Low
Asked at 1 company
Category
487
questions in SQL
Difficulty Split
130E|271M|86H
in this category
Total Bank
1,863
across 7 categories
Reported in Interview Loops AtClick to view company-specific questions
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Key Concepts Tested
joinsql
Expert Answer
59 words

Common errors: (1) Non-aggregated column in SELECT without GROUP BY. (2) Aggregate in WHERE instead of HAVING. (3) Alias in WHERE (not yet evaluated). (4) NULL in NOT IN. (5) Missing join condition = Cartesian. (6) Division by zero. (7) Type mismatch. Debug: Isolate subqueries; EXPLAIN; validate row counts. Process: Read error message; trace referenced line; check clause order.

⚡
Pro Tip

Red Flag: Guessing—systematically isolate. Pro-Move: 'We built a query validator that checks GROUP BY consistency and NOT IN nullability before execution—caught 15 bugs in pipeline.'

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