js demo 计算本年度还剩下多少天

在 MySQL 默认引擎 InnoDB 中，索引大致可分为两类：聚簇索引和非聚簇索引，它们的区别也是常见的面试题，所以我们今天就来盘它们。

聚簇索引（Clustered Index）一般指的是主键索引（如果存在主键索引的话），聚簇索引也被称之为聚集索引。

聚簇索引在 InnoDB 中是使用 B+ 树实现的，比如我们创建一张 student 表，它的构建 SQL

以上 student 表中有一个聚簇索引（也就是主键索引）id，和一个非聚簇索引 class_id。

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