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  • Interview Prep
SQL Core
  • SQL Core Questions
  • Window Functions and Ranking Interviews
  • Join Debugging and Grain Traps
  • CTE and Subquery Tradeoffs
Modeling Design
  • Modeling and System Design Questions
  • Star Schema Interview Drills
  • OLTP vs OLAP Design Drills
  • Metric Layer Design Prompts
Case Studies
  • Case Study Prompts
  • Case Study: Ecommerce KPI Regression
  • Case Study: Insurance Loss Ratio
  • Case Study: SaaS Retention Analysis
Timed Mocks
  • 30-Minute SQL Mock
  • 15-Minute Screen SQL Mock
  • 45-Minute Senior Analytics Mock
Follow Up Drills
  • Edge Cases and Debugging Drills
  • Requirement Change Drills
  • Null, Timezone, and Data Type Pitfalls
  • Explain and Defend Tradeoffs
Home / Interview Prep / SQL Core

SQL Core

Learn SQL sql core with practical examples and guided drills on dbSyntax.

Start with SQL Core Questions

SQL Core Questions

This lesson simulates common SQL interview patterns with increasing difficulty and explicit scoring criteria. Focus areas: grain correctness...

Window Functions and Ranking Interviews

This lesson trains ranking questions that appear in SQL interviews across analyst and analytics-engineer roles. Skills tested: choosing ROW_...

Join Debugging and Grain Traps

This lesson focuses on the most frequent SQL interview failure: wrong totals due to mixed grain joins. Interview expectation: diagnose quick...

CTE and Subquery Tradeoffs

Interviewers evaluate reasoning quality, not just syntax. This lesson helps you justify CTE vs subquery decisions....

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