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X-Space | 关注Linux,PHP
where f.type = fruits.type and f.price <= fruits.price<br /><br /> ) <= 2;</p><br /> <p>这次的代码要优雅很多,而且在N增加时不需要重新代码(非常棒!)。但是这个查询在功能上和原来的是一样。他们的时间复杂度均为分组中条目数的二次方。而且,很多优化器都不能优化这种查询,使得它的耗时最好为全表行数的二次方...