mongodb 分组如何返回所有字段 - V2EX

mongodb 分组如何返回所有字段 - V2EX

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[ { "$group": { "_id": "$username", "total": {"$sum": 1} } } ]

想实现的是

select count(*) as total, * from table group by username

1 条回复 2021-12-10 08:59:04 +08:00

1

namidairo

2021-12-10 08:59:04 +08:00

```
[
{
$group: {
_id: "$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

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