1.Mysql索引之-cardinality
https://blog.csdn.net/weigeshikebi/article/details/80214965
2.MySQL中Cardinality值的介绍
https://www.cnblogs.com/olinux/p/5140615.html
3.MySQL里执行SHOW INDEX结果中Cardinality的含义
https://www.cnblogs.com/xiaotengyi/p/3556761.html
Mysql索引之-cardinality
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