Data Analyst Interview Questions 2026: What Actually Shows Up Across All Three Rounds

Short summary

Data analyst interviews in 2026 typically span three rounds: SQL technical (testing query patterns, window functions, NULL handling), business case problems (testing hypothesis-driven thinking), and behavioral questions (evaluating impact on actual decisions). Most candidates fail by being strong in one area but weak in others. The guide covers common SQL pitfalls, how to approach business case analysis with metrics-first thinking, behavioral structures that land, and statistical concepts that trip up strong technicians—plus a recommendation to practice full simulated rounds under time pressure.

• •DA interviews have three distinct rounds: SQL technical, business case, and behavioral—success requires strength across all three
• •SQL patterns that consistently appear: retention calculations with CTEs, window functions, duplicate removal, join optimization, and NULL handling
• •Business case and behavioral success depend on hypothesis-driven thinking and connecting analysis to actual business impact

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