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[英]Aggregate Group by using minimum value and display count for each group at MongoDB
[英]MongoDB: Count by unique value after aggregate by group
我已经按组计算了唯一值这是示例数据
[
{
iphone: iphone6,
name: Tom
},
{
iphone:iphone7,
name: Tom
},
{
iphone:iphone6,
name: Joe
},
{
iphone:iphoneX,
name: Joe
}
]
我想通过显示如下进行分组:
[
{
_id:iphone6,
people:[Tom,Joe]
},
{
_id:iphone7,
people:[Tom]
},
{
_id:iphoneX,
people:[Joe]
}
]
我在使用 $group 时遇到问题。 我怎样才能做到这一点?
$group
:按iphone
和$push
name
分组到people
数组字段。$sort
(可选):按_id
升序排序。db.collection.aggregate([
{
$group: {
_id: "$iphone",
people: {
$push: "$name"
}
}
},
{
$sort: {
_id: 1
}
}
])
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