phData Interview Questions
The questions to prepare for phData interviews, across all roles. Questions from real interview reports rank first. Updated weekly.
Rank Genesys Cloud customers by completed revenue using aggregation, a CTE, and ROW_NUMBER().
phDataAggregate monthly sales by product category and use LAG to calculate month-over-month changes.
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Benjamin MooreRank the top 3 completed rides per vehicle per day using joins, a CTE, and ROW_NUMBER.
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Approach for maintaining data quality and integrity across ETL pipelines.
phDataExplain how supervised and unsupervised learning differ, and ground the distinction in a practical ML example.
phDataDescribe an embedded project challenge, how you mitigated risk, managed stakeholders, and made trade-offs to deliver.
phDataDesign a marketing campaign experiment with a pre-registered metric plan, power calculation, and ship rule that respects guardrails.
phDataInvestigate why a key KPI moved the wrong way after a product change and separate signal from noise.
phDataExplain how to test whether an observed experiment lift is real using hypothesis testing, p-values, and confidence intervals.
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