select 具有最小值 $Min 的单个文档 mongodb
select single document with minimum value $Min mongodb
为了 select 包含数据库中最小值的单个特定文档,我做了很多努力。
let Lowestdate = await BTCMongo.aggregate(
[
// { "$sort": { "name": 1,
{
$match : { "createdAt" : { $gte: new Date(last),$lte: new Date(NEW) } } },
{
$group:
{
_id:null,
minFee_doc:{$min: "$$ROOT"},
minFee: { $min:{$toDouble:"$one"}},
firstFee: { $first: "$one" },
lastFee: { $last: "$one" },
maxFee: { $max: {$toDouble:"$one"}},
}
},
]
).then(result => {}):
with minFee_doc:{$min: "$$ROOT"},
我一直在尝试 return 包含最少 $min
的文档,但它保持 returning 包含 $first
[=17 的文档=]
如何select获得最小值的文档?
注意:我想 return 整个文档,包括“CreatedAt”、“UpdatedAt”和 _id。包含最小值的文档
预期结果应如下所示:
{
"minFee_doc": {
"_id": "61e84c9f622642463640e05c",
"createdAt": "2022-01-19T17:38:39.034Z",
"updatedAt": "2022-04-24T14:48:38.100Z",
"__v": 0,
"one": 2
},
"minFee": 2,
"firstFee": 3,
"lastFee": 5,
"maxFee": 6
}
编辑:也提供单个文档而不是多个
$push
$group
中的所有文档然后 $set
包含 $filter
的数组
db.collection.aggregate([
{
$match: {}
},
{
$group: {
_id: null,
minFee_doc: { $push: "$$ROOT" },
minFee: { $min: { $toDouble: "$one" } },
firstFee: { $first: "$one" },
lastFee: { $last: "$one" },
maxFee: { $max: { $toDouble: "$one" } }
}
},
{
$set: {
minFee_doc: {
$filter: {
input: "$minFee_doc",
as: "m",
cond: { "$eq": [ "$$m.one", "$minFee" ] }
}
}
}
}
])
为了 select 包含数据库中最小值的单个特定文档,我做了很多努力。
let Lowestdate = await BTCMongo.aggregate(
[
// { "$sort": { "name": 1,
{
$match : { "createdAt" : { $gte: new Date(last),$lte: new Date(NEW) } } },
{
$group:
{
_id:null,
minFee_doc:{$min: "$$ROOT"},
minFee: { $min:{$toDouble:"$one"}},
firstFee: { $first: "$one" },
lastFee: { $last: "$one" },
maxFee: { $max: {$toDouble:"$one"}},
}
},
]
).then(result => {}):
with minFee_doc:{$min: "$$ROOT"},
我一直在尝试 return 包含最少 $min
的文档,但它保持 returning 包含 $first
[=17 的文档=]
如何select获得最小值的文档?
注意:我想 return 整个文档,包括“CreatedAt”、“UpdatedAt”和 _id。包含最小值的文档
预期结果应如下所示:
{
"minFee_doc": {
"_id": "61e84c9f622642463640e05c",
"createdAt": "2022-01-19T17:38:39.034Z",
"updatedAt": "2022-04-24T14:48:38.100Z",
"__v": 0,
"one": 2
},
"minFee": 2,
"firstFee": 3,
"lastFee": 5,
"maxFee": 6
}
编辑:也提供单个文档而不是多个
$push
$group
中的所有文档然后 $set
包含 $filter
db.collection.aggregate([
{
$match: {}
},
{
$group: {
_id: null,
minFee_doc: { $push: "$$ROOT" },
minFee: { $min: { $toDouble: "$one" } },
firstFee: { $first: "$one" },
lastFee: { $last: "$one" },
maxFee: { $max: { $toDouble: "$one" } }
}
},
{
$set: {
minFee_doc: {
$filter: {
input: "$minFee_doc",
as: "m",
cond: { "$eq": [ "$$m.one", "$minFee" ] }
}
}
}
}
])