mongo多个条件分组

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mongodb 有哪些实现多个多个分组的？我知道mapreduce可以，还有吗？？

9 years, 6 months ago

Willow桑 9 years, 6 months ago

mongodb 中提供了聚合方法，其中的 $group 应该能达到你要的分组效果

answered 9 years, 6 months ago

湯淺比吕美 answered 9 years, 6 months ago

这个我用过几次, 我帖段代码出来你看看

answered 9 years, 6 months ago

天天看飞机 answered 9 years, 6 months ago

什么叫多个条件分组？？
什么叫多个多个分组？？

answered 9 years, 6 months ago

机关枪G answered 9 years, 6 months ago