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sql-optimization

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SQL 优化与调优

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# SQL 优化与调优

## 概述
慢查询分析、执行计划、索引优化等通用 SQL 优化技能。

## 执行计划分析

### MySQL EXPLAIN
```sql
-- 基础执行计划
EXPLAIN SELECT * FROM users WHERE email = 'test@example.com';

-- 详细执行计划
EXPLAIN ANALYZE SELECT * FROM users WHERE email = 'test@example.com';