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Database Query Optimizer

Optimize these slow database queries for [DATABASE TYPE]:

[PASTE QUERIES OR DESCRIBE THE PROBLEM]
For each query:
1. Analyze the execution plan (EXPLAIN output interpretation)
2. Identify bottlenecks (full table scans, missing indexes, joins, subqueries)
3. Rewrite the optimized query
4. Add appropriate indexes (with CREATE INDEX statements)
5. Estimate performance improvement
6. Consider if denormalization would help
7. Suggest materialized views for complex aggregations
8. Connection pooling recommendations
9. Caching layer for frequently-run queries
10. Monitoring setup for ongoing query performance
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