Optimize Complex SQL Queries

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90 minutes

5 steps

·Advanced

After 90 min: Dramatically faster query execution and reduced database load

What you need

LaptopDatabase with real dataQuery analyzer tool

The 90-Minute Plan

Profile Queries0–15 min

Use EXPLAIN PLAN to understand query execution. Identify slow queries.

Create Strategic Indexes15–35 min

Build indexes on frequently searched columns and joins.

Rewrite Complex Queries35–55 min

Optimize joins, subqueries, and aggregations. Use window functions.

Implement Caching55–75 min

Cache frequent queries. Use materialized views for complex aggregations.

Ship & next steps75–90 min

Monitor improvements. Document optimizations. Next: explore partitioning.

Pro Tip

Measure before and after. Small improvements at scale matter. Don't over-index.

90 min·5 steps

TechBeginner

After 90 min: Ability to extract, filter, and analyze data from a real database

7,923

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90 min·5 steps

TechIntermediate

After 90 min: A properly structured database for a real application or business problem

6,912

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90 min·5 steps

TechAdvanced

After 90 min: A reusable library of UI components for your projects and team

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90 min·5 steps

TechAdvanced

After 90 min: A scalable microservices architecture for a distributed application

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