SBB Interview Questions
The questions to prepare for SBB interviews, across all roles. Questions from real interview reports rank first. Updated daily.
Calculate each CVS store's 7-day rolling sales average using a CTE, aggregation, join, and window function.
Explain how to ensure data accuracy in SQL workflows using validation checks, reconciliation, and careful query design.
Explain how you diagnosed and optimized a slow PostgreSQL query using execution plans, indexing, and query rewrites.
Rank the top 3 completed rides per vehicle per day using joins, a CTE, and ROW_NUMBER.
WaymoUse ROW_NUMBER() to keep the earliest created_at 'Repl created' per entity and return out-of-order duplicates to delete.
Replit
QuantcastInvestigate a 15% engagement decline by decomposing the metric, isolating root causes, and proposing actions.
Design an A/B test for a new platform feature, including success metrics, power, guardrails, and a clear ship decision.
Explain what statistical significance means and why it matters when interpreting experimental or analytical results.
Outline the first checks to diagnose a sudden drop in a core product metric, starting with data quality, scope, and decomposition.
Explain common online experimentation pitfalls and how to design, analyze, and decide in ways that avoid false wins.
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