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数据库/mysql/索引.md Normal file
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索引是帮助数据库高效获取数据的*排好序*的*数据结构*
聚簇索引（聚集索引），索引与数据放在一起，索引结构的叶子节点保存了行数据
非聚簇索引，索引与数据不放在一起，索引结构的叶子节点指向了数据对应的位置