摘要: 1.覆盖索引 covering index: https://blog.csdn.net/cckevincyh/article/details/119655516 2.pk must be a clustered index normal index can be clusted index or 阅读全文
posted @ 2023-11-13 19:49 PEAR2020 阅读(30) 评论(0) 推荐(0)