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mysql中order by与group by的区别_MySQL

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Release: 2016-06-01 13:25:17
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bitsCN.com order by 从英文里理解就是行的排序方式,默认的为升序。 order by 后面必须列出排序的字段名,可以是多个字段名。     
group by 从英文里理解就是分组。必须有“聚合函数”来配合才能使用,使用时至少需要一个分组标志字段。 
什么是“聚合函数”? 
像sum()、count()、avg()等都是“聚合函数” 
使用group by 的目的就是要将数据分类汇总。bitsCN.com

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