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Find the error in the provided SQL query.

SQLmedium0.3 min read

**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...

🤖 Analyze Your Answer
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
Asked at these companies
Grover
Key Concepts Tested
joinsql

Why This Question Matters

This medium-level SQL question appears frequently in data engineering interviews at companies like Grover. While less common, it tests deeper understanding that distinguishes strong candidates. Mastering the underlying concepts (join, sql) will help you answer variations of this question confidently.

How to Approach This

Break this problem into components. Identify the core trade-offs involved, then walk the interviewer through your reasoning step by step. Demonstrate awareness of edge cases and production considerations - this is what separates good answers from great ones.

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.

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According to DataEngPrep.tech, this is one of the most frequently asked SQL interview questions, reported at 1 company. DataEngPrep.tech maintains a curated database of 1,863+ real data engineering interview questions across 7 categories, verified by industry professionals.

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