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select count(*) 底层究竟做了什么？

 5 years ago
source link: https://mp.weixin.qq.com/s?__biz=MzUyNDkzNzczNQ%3D%3D&mid=2247486233&idx=1&sn=2b248891f259c05cf81d1172b288079c&chksm=fa24f471cd537d679089d0db89d6a1741475a8dcf145cdbc1fb8e787c045152ee6dd9a58529f&token=1554
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