Phase 15 · Interview Preparation
SQL & TechnicalQuery Optimization Questions
Part of the Data Analyst Roadmap.
Summary
'How would you make this slow query faster?' — testing your understanding of indexes, unnecessary joins, and query structure from Phase 3.
How to Learn This
- 1Review Phase 3's query optimization basics before technical interviews.
- 2Practice explaining why SELECT * is slower than selecting only needed columns.
- 3Learn to reason about a query's likely bottleneck even without running EXPLAIN live.
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