I have a data set looks as
我的数据集看起来像
{"BrandId":"a","SessionId":100,"Method": "POST"}
{"BrandId":"a","SessionId":200,"Method": "PUT"}
{"BrandId":"a","SessionId":200,"Method": "GET"}
{"BrandId":"b","SessionId":300,"Method": "GET"}
{"Bra
阅读背景：
如何在MongoDB中加入两个聚合结果？
来源：互联网
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