數據庫知識點

https://blog.csdn.net/zsq520520/article/details/68954646 https://blog.csdn.net/Hectorhua/article/details/13767361html  彙集索引與非彙集索引 https://www.cnblogs.com/s-b-b/p/8334593.htmlmysql 內鏈接和外鏈接的區別 內鏈接(天然鏈接)

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