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db.collection.aggregate([
{
"$group": {
"_id": {
"date": {
$dateToString: {
format: "%Y-%m-%d",
date: "$time"
}
},
"product": "$product"
}
}
},
{
"$group": {
"_id": "$_id.date",
"count": {
"$sum": 1
}
}
}
])
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