mysql组合索引索引
在网络上看到资料了解到 mysql 的索引使用 B-tree 实现的，使用关键字来存储索引的列。
单列的索引是使用一个 B-tree 的方式实现的。
但是，网上的大多资料都没有提及，组合索引的具体实现。
我个人猜测组合索引也是使用一个 B-tree 来实现，其中关键字同时存储的是多个列的。
B-tree 根据多个列进行排序。这样正好可以很好地解释“最左前缀”。
不知道我的猜测是否正确？！！！
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