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腾讯面试：一条SQL语句执行得很慢的原因有哪些？
source link: https://juejin.im/post/5cbed894e51d456e8240dd00
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文章来源：网络说实话，这个问题可以涉及到 MySQL 的很多核心知识，可以扯出一大堆，就像要考你计算机网络的知识时，问你“输入URL回车之后，究竟发生了什么”一样，看看你能说出多少了。之前腾讯面试的实话，也问到这个问题了，不过答的很不好，之前没去想过相关原因，
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