linux命令 https://www.cnblogs.com/student-programmer/p/6829116.html
常用sql https://blog.csdn.net/xf_yan/article/details/80464835
sql优化 https://blog.csdn.net/weixin_42047611/article/details/81772149
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原文：https://www.cnblogs.com/LZHOO97/p/12393292.html
