SQL Interview Practice
Practice the SQL questions that show up in analyst interviews: joins, aggregates, grouped reports, CASE logic, date ranges, window functions, CTEs, subqueries, ranking, running totals, and the debugging steps that separate a working answer from a lucky one.
These pages are built around interview prompts, not syntax memorization. Each topic shows what the interviewer is testing, how to structure an answer, and which SQLShed lessons or playground missions let you practice the same pattern against real tables.
Use them after the main learning path or as a focused review before a screen. For every question, say the grain of the result first, name the table relationships, then write the query in small steps so mistakes are easy to catch.
SQL JOIN interview questions
Practice join keys, INNER vs LEFT JOIN, duplicate rows, and missing matches.
Practice questions →SQL GROUP BY interview questions
Practice counts, sums, averages, HAVING, and grouped business reports.
Practice questions →SQL window function interview questions
Practice ROW_NUMBER, RANK, running totals, LAG, and top row per group.
Practice questions →SQL ranking and Top-N interview questions
Practice top rows, tie handling, rank functions, and top-N per group reports.
Practice questions →SQL self join interview questions
Practice comparing rows in the same table, pairs, gaps, and manager-style relationships.
Practice questions →SQL deduplication interview questions
Practice DISTINCT, GROUP BY, ROW_NUMBER, duplicate audits, and choosing the keeper row.
Practice questions →SQL CTE interview questions
Practice WITH clauses, step-by-step reports, reusable logic, and readable query plans.
Practice questions →SQL subquery interview questions
Practice scalar, IN, EXISTS, NOT EXISTS, and correlated subquery prompts.
Practice questions →SQL CASE interview questions
Practice bucketing rows, conditional counts, business labels, and report flags.
Practice questions →SQL date range interview questions
Practice date filters, half-open ranges, monthly buckets, and lead-time reports.
Practice questions →SQL funnel analysis interview questions
Practice distinct counts, stage reach, conversion rates, and drop-off checks.
Practice questions →Answer the business question
Most SQL interview prompts are short, but the expected answer includes assumptions: what counts as a customer, whether unmatched rows stay, and how ties or duplicate rows should be handled.
Explain the result grain
Before typing, state whether the result is one row per customer, order, category, channel, or event. That single sentence prevents many join and GROUP BY mistakes.
Verify with small checks
Good candidates debug as they go: count source rows, inspect join matches, compare grouped totals, and test tie cases before treating an answer as final.