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SQL HAVING Clause Interview Questions (2025)

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SQL HAVING Clause Interview Questions

SQL HAVING Clause Interview Questions

HAVING questions test your ability to filter aggregated data, a critical skill that goes beyond basic GROUP BY.

Expect questions combining GROUP BY, aggregates (SUM, COUNT, AVG), and HAVING conditions.

Interviewers evaluate whether you understand the difference between WHERE and HAVING, and proper ordering of clauses.

571Questions

95Companies

Easy 23 • Medium 7 • Hard 0Difficulty mix

Common SQL HAVING interview patterns

Filtering groups with HAVING vs filtering rows with WHERE
HAVING with COUNT, SUM, AVG, and other aggregates
TOP N per group using HAVING with aggregates
Multiple conditions in HAVING clauses
HAVING with complex aggregate expressions
Combining GROUP BY, WHERE, and HAVING in the correct order

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Common mistakes with HAVING

Using WHERE instead of HAVING to filter aggregates
Incorrect clause ordering (HAVING before GROUP BY)
Aggregating already-aggregated values in HAVING
Confusion between row-level filters (WHERE) and group-level filters (HAVING)
Not considering NULL values in aggregate conditions

How HAVING questions are evaluated in interviews

Understanding the execution order of clauses is key.

Explain why WHERE filters rows but HAVING filters groups.

Demonstrate correct aggregate function usage in filtering contexts.

Related SQL concepts

SQL aggregation interview questions
SQL JOIN interview questions
SQL window function interview questions
SQL CASE WHEN interview questions

SQL HAVING Clause Interview FAQs

What is the difference between WHERE and HAVING?

WHERE filters individual rows before aggregation occurs. HAVING filters groups after aggregation. You use WHERE to exclude rows from being aggregated, and HAVING to exclude groups from the final result.

Can you use HAVING without GROUP BY?

Some databases allow it, treating the entire result set as one group. However, this is generally considered non-standard and not recommended. Always pair HAVING with GROUP BY for clarity and portability.