Home Sign Up Sign In
V2EX = way to explore
V2EX 是一个关于分享和探索的地方
Sign Up Now
For Existing Member  Sign In
V2EX  ›  namidairo  ›  全部回复第 1 页 / 共 1 页
回复总数  1
2021 年 12 月 10 日
回复了 fangwenxue 创建的主题 › 问与答 › mongodb 分组如何返回所有字段
```
[
{
$group: {
_id: "$username",
amount: {$sum: 1},
items: {$push: "$$ROOT"}
}
}
]
```
push: https://docs.mongodb.com/manual/reference/operator/aggregation/push/#mongodb-group-grp.-push
$$ROOT: https://docs.mongodb.com/manual/reference/aggregation-variables/#mongodb-variable-variable.ROOT
About   ·   Help   ·   Advertise   ·   Blog   ·   API   ·   FAQ   ·   Solana   ·   3179 Online   Highest 6679   ·     Select Language
创意工作者们的社区
World is powered by solitude
VERSION: 3.9.8.5 · 13ms · UTC 00:21 · PVG 08:21 · LAX 17:21 · JFK 20:21
♥ Do have faith in what you're doing.