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mongodb 分组统计

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db.getCollection('cart').aggregate([
{
$match: {
"company_id": 2057013
}
},
{
$group: {
_id: {
"self_company_id": "$self_company_id",
"user_id": "$user_id",
},
total: {
$sum: 1
}
}
},
{
$sort: {total: -1}
}
])