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mysql 联合索引和BTree
2022-06-11 19:03:00 【后觉2022】
联合索引的最左前缀原则
规则如下：
如果想使用联合索引，联合索引的最左边的列必须作为过滤条件，否则联合索引不会生效。
7.联合索引（最左前缀原则）_程序员小牧之的博客-CSDN博客_联合索引
explain select * from a
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