java 或者sqlServer 如何自动判断给时间分组
@漫天de光: 整了半天,你就是想一句话搞定是吧? 基本上没有意义,如果你不纠结于一句SQL搞定的话,我相信你也很快能写出代码来。 需求不明确的地方是,间隔小于1分钟,还是使用标准的分钟隔离。(08:57:59和08:58:03算两个分钟段)这个就当你说清楚了,然后
@漫天de光: 整了半天,你就是想一句话搞定是吧?
基本上没有意义,如果你不纠结于一句SQL搞定的话,我相信你也很快能写出代码来。
需求不明确的地方是,间隔小于1分钟,还是使用标准的分钟隔离。(08:57:59和08:58:03算两个分钟段)这个就当你说清楚了,然后示例子中没有说明,如果这样的数据怎么处理
08:57:59
08:58:03
08:58:12
08:59:02
08:59:50
如果是相隔不超过1分钟,就一直取下去,直到出现超过1分钟的时间,(这样描述会不会更加准确一些,或者更不容易引起误解?)
象这样的,你要么增加一个字段,代码处理结果放在那个字段里面,以后就可以GROUP BY了。
要么就是这时候使用一句SQL或者使用多句SQL语句的重要性并不是那么强。
我是反对唯性能论的。

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