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o9 Solutions Software Engineer Interview Questions
The questions to prepare for a o9 Solutions Software Engineer interview. Questions from real interview reports rank first. Updated daily.
2questions
~1htotal time
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SQL & Data ManipulationStart here. 1 question + 3 drills · ~39 min
Explain SQL Join TypesEasy
Recently asked
Explain INNER, LEFT, RIGHT, FULL OUTER, CROSS, and SELF JOINs with examples and when to use each.
JoinsData WranglingGroup Byoo9 Solutions
Advanced SQL Functions and WindowingMedium
Practice
Practice drillAggregate January transaction totals and rank categories using a window-function rewrite.
Data ManipulationGroup ByAggregationsTTS Imagineoo9 SolutionsHH & R Block
Optimize Slow Queries on Large DataMedium
Practice
Practice drillOptimize a slow PostgreSQL query on a large dataset by choosing better filters, joins, and indexes.
Performance Tuningdatabase optimizationdatabase management
CitiOOptimoveTThoucentric
CitiOOptimoveTThoucentricSQL Indexes and PerformanceEasy
Practice
Recently asked
Practice drillDescribe what an SQL index is and how it improves query performance.
database optimizationdatabase managementdatabase conceptsIInnovacceroo9 Solutions
Tesla
Tesla2
Coding1 question · ~9 min
Algorithm Performance OptimizationMedium
Assesses your ability to analyze bottlenecks and apply performance improvements.
performanceoo9 Solutions
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The finish line: interview-readyComplete all 2 questions plus 3 hands-on drills to finish this plan.