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.
24 articles in Interview Prep · Page 1 of 3
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.
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.
Data Analyst Interview Questions 2026: Complete Preparation Guide
30+ real data analyst interview questions with schemas, solutions & pitfalls — SQL OAs vs live technical rounds, Python, modern data stack, product cases & behavioral.
SQL Interview Questions for Data Analyst (2026 Guide)
Master 2026 SQL interview questions for data analysts. Real queries, window functions, joins, common traps, and runnable code solutions.
SQL Joins Practice Exercises: 15 Real Queries & Answers
Master SQL joins with 15 real business practice exercises. Solve INNER, LEFT, RIGHT, FULL OUTER, CROSS, and SELF JOINs with schemas and expected outputs.