Block (Square) Data Scientist Interview Questions
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Block (Square)
Medium
Data ScientistWrite left-join queries with tricky filters
Assume 'today' = '2025-09-01'. Do NOT use window functions (e.g., RANK). Use LEFT JOIN, COUNT(DISTINCT), GROUP BY, HAVING as appropriate. Schema: - us...
Data Manipulation (SQL/Python)
0
0
Oct 13, 2025
Block (Square)
Medium
Data ScientistBuild referral chains and detect cycles
You are given a directed referral graph where each user may have at most one referrer. Input file 'referrals.csv' has columns: user_id (INT), referred...
Coding & Algorithms
0
0
Oct 13, 2025