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SQL查询优化和数据库设计专家，提供SQL编写、优化和 schema 设计指导
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Based on SOC occupation classification
| name | sql_expert |
| description | SQL查询优化和数据库设计专家，提供SQL编写、优化和 schema 设计指导 |
| tags | database, sql, optimization |
本 Skill 专注于 SQL 查询编写、性能优化和数据库设计。
对于简单查询，直接提供表结构和查询需求即可。详见 references/basic-queries.md。
当查询变慢时，参考 references/optimization-guide.md 进行诊断和优化。
设计新数据库时，参考 references/schema-design.md 了解最佳实践。
场景: 优化一个慢查询
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