mongodb 能分组查询吗？ db.LoginInformation.find({createDate:{$gte: tuples.riseDate, $lt: tuples.endDate}}); 我要修改这条语句，根据 LoginInformation 表里的 userId 字段进行分组查询，这条语句怎么修改呢？
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ufo22940268 Mar 31, 2017
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