Yahoo Data Manipulation (SQL/Python) Interview Questions
Master your tech interview with our curated database of real questions from top companies.
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Yahoo
Medium
Data ScientistCalculate Total Spend and Identify Key User Metrics
Transactions +----+---------+--------+------------+ | id | user_id | amount | date | +----+---------+--------+------------+ | 1 | 101 | 23....
Data Manipulation (SQL/Python)
68
0
Jul 12, 2025
Yahoo
Medium
Data ScientistUse OrderedDict to dedupe stably
Implement dedupe_preserve_order(seq) that removes duplicates from a list while preserving the order of first appearance, in O(n) time and O(k) space (...
Data Manipulation (SQL/Python)
0
0
Oct 13, 2025
Yahoo
Medium
Data ScientistDiagnose DAU drop with SQL by country
Write a single SQL query to diagnose a country-level DAU drop for an email product. Assume today is 2025-09-01. DAU is the count of distinct user_id w...
Data Manipulation (SQL/Python)
0
0
Oct 13, 2025