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原文参考:http://www.51ou.com/browse/msyql/43081.html having 和 where 参考 http://blog.csdn.net/yexudengzhidao/article/details/54924471 having是对组进行过滤。where是对行 阅读全文
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原文地址: http://www.toptal.com/php/10-most-common-mistakes-php-programmers-make 译文地址:http://codecloud.net/php-2056.html Common Mistake #1: Leaving dangli 阅读全文