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修改:部分文章的错误语义&README
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guang19 committed May 10, 2020
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### 什么是索引?
**索引是一种用于快速查询和检索数据的数据结构。
见的索引结构有: B树, B+树和Hash。**
常见的索引结构有: B树, B+树和Hash。**

**索引的作用就相当于目录的作用。**

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