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为什么主键 id 和 pid 都是索引, id > 10 走索引 time > 10 不走索引? 他们的值一样我发现 id > 或者 < 怎么都走索引的
拥有18年软件开发和IT教学经验。曾任多家上市公司技术总监、架构师、项目经理、高级软件工程师等职务。 网络人气名人讲师,...
Do you know what an index is?
Is the time field indexed? I haven’t created an index yet, how can I index it?
mysql中表的主键默认是有索引的,其他字段的索引需要额外添加的。
Do you know what an index is?
Is the time field indexed?
I haven’t created an index yet, how can I index it?