Most people preparing for data analyst interviews in 2026 treat them like SQL exams. That is the wrong mental model, and it is why so many good candidates do not make it past the first technical round. Data analyst interviews are business problem-solving exercises that happen to involve SQL. The SQL is the tool, not the point. Here is what the actual structure looks like and how to prepare for each part. What Every Data Analyst Interview Actually Tests Most companies run three to five rounds for DA roles. Each one tests something distinct. SQL Technical You need to write accurate, optimized queries under time pressure -- usually 2-3 problems in 30-45 minutes. The minimum bar in 2026: joins (INNER vs LEFT, knowing when each is appropriate), GROUP BY with HAVING, subqueries, and window functions like ROW_NUMBER, RANK, and SUM OVER. The common failure mode is writing code that works but not being able to explain why each choice was made.…