如果由我们来设计主题表和回帖表，通常的做法是如下。
这样在获取主题列表时，直接使用分页算法提取Topics；查看某一帖子时，还需要对Topics，Posts进行jion链接。
此种设计的缺陷为：
1. Topics表存储Content的内容，其体积将会很大，对大体积表进行分页，性能很慢。
2. 显示Posts内容时将进行join操作，损耗性能
而Discuz的做法是进行如下设计。
将Topics里的Content拆分到Posts中去，同时Topics的主题帖也作为回帖放置到Posts里面，这样就解决了上面我们提出的两个问题。这是典型的违反数据库设计范式以换取更好性能的示例。
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