Interview Prep
SQL, Python and case-study questions that actually appear in data analyst interviews, with the pattern behind each one and how to practice it.
27 articles in Interview Prep · Page 1 of 3
Langchain Interview Questions (2026 Guide & Answers)
Prepare for LangChain interview questions with core concepts, LCEL syntax, RAG retrieval traps, agent memory benchmarks, and practical 2026 code solutions.
SQL Joins Interview Questions (2026 Guide & Answers)
Master sql joins interview questions with practical answers, scenario-based code, edge cases, trap queries, and execution benchmarks for 2026 interviews.
5 Window Traps That Lie
Basket-split LAG gaps, ghost orders, nondeterministic ROW_NUMBER, RANK gaps, unframed running totals: 5 window traps with fixes and SQL included.
30 SQL Interview Questions, Free
The 30 SQL patterns analyst interviews repeat — JOINs, windows, GROUP BY traps, NULLs, dates, CTEs — indexed by pattern with live practice links.
Tricky Sql Interview Questions (2026 Guide & Answers)
Master tricky sql interview questions with 15 scenario problems, trap-vs-fix queries, join edge cases, execution plans, and verified answers for 2026.
4 GROUP BY Traps, Wrong vs Right
WHERE vs HAVING, nullable grouping keys, bare SELECT columns: 4 GROUP BY traps that run without errors yet fail take-homes, each with the fix.
5 SQL Date Patterns for Interviews
Month-over-month growth, rolling averages, cohorts, weekday splits, days-between events: the 5 SQL date patterns analyst JDs repeat, with queries.
RANK vs DENSE_RANK: Tie-Traps
Top-3-per-group with ties: ROW_NUMBER vs RANK vs DENSE_RANK explained side by side, plus 5 tie-trap drills with full answer keys for interviews.
SQL Interview Questions for Experienced (2026 Guide)
Ace sql interview questions for experienced data analysts. Master window functions, query optimization, join fan-out, and scenario CTEs with code.