效率排序:count(字段)<count(主键id)<count(1)≈count(*)

发布时间 2023-07-11 09:45:45作者: 不识人间烟火的你

参考文档1
https://blog.csdn.net/zhangzl1012/article/details/78056904?locationNum=5&fps=1
参考文档2
https://blog.csdn.net/qq_34481955/article/details/120867482?spm=1001.2101.3001.6650.1&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-1-120867482-blog-78056904.235%5Ev38%5Epc_relevant_anti_t3&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-1-120867482-blog-78056904.235%5Ev38%5Epc_relevant_anti_t3&utm_relevant_index=2