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On Mon, 5 Aug 1996, Peter P. Eiserloh wrote: We need to keep a clear the concept of threads. Too many people seem to confuse a thread with a process. 阅读全文
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Most of the tools do not actually read a single line in from a file at a time, rather they use a buffer in memory to store chunks of lines. The tools 阅读全文
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What is the difference between HTTP_CLIENT_IP and HTTP_X_FORWARDED_FOR? it is impossible to say. Different proxies may implement these, or may not. Th 阅读全文
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两个表可以简单地写为select a.*,b.* from a left join b on a.id =b.id;三个以上select a.*,b.* from a left join b on a.id=b.id left join c on a.id=b.id where具体的例子select... 阅读全文