Learning the underlying structure of MySQL index

                                                       

##Preface

When it comes to database indexes, everyone must be familiar with them. In daily work often come into contact with. I have read a lot of related articles, books and courses in the past few days. I decided to summarize an article myself. Although the article I wrote is definitely not as good as the articles written by various experts on the Internet, I will remember it more firmly after summarizing it myself.

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