目录select_related：1、模型类创建2、添加admin站点，插入测试数据3、select_related示例查询3.1 普通查询3.2 外键查询3.3 性能优化3.4 其他示例4、prefetch_related示例查询4.1 普通查询4.2 性能优化django中的ORM
If one could put an array of pointers to child structs inside unsafe structs in C# like one could in C, constructing complex data structures without the overhead of having one object per node would be
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