In database management, indexing is an indispensable tool. Not only does it improve data retrieval speed, it also helps with database optimization. This article will introduce in detail the concepts, types and applications of indexes in MySQL, as well as how to use indexes efficiently.
We will explore this topic using data from the game "Three Kingdoms" as an example.
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index
An index is a data structure used to quickly find rows in a database table. A table without indexes is called a heap table. To find specific data in a heap table, you must search row by row, which is usually very inefficient.
For example, suppose there is a player data table in the game "Three Kingdoms", which contains millions of records. If you want to find information about a player named "Cao Cao" without an index