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不得不看，只有专家才知道的17个SQL查询提速秘诀！
source link: http://database.51cto.com/art/201801/564666.htm
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通常，开发人员找到自己青睐的方法，而懒得研究其他方法。这也许是缺乏教育的表现，或者开发人员没有认识到自己何时做错了。也许针对一组本地测试数据，查询运行起来顺畅，但是换成生产级系统，表现就差强人意。
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