|
{
"beer_name" : "Floris Framboise",
"brewery_name" : "Huyghe"
}
{
"beer_name" : "Arabier",
"brewery_name" : "De Dolle Brouwers"
}
{
"beer_name" : "La Trappe Dubbel",
"brewery_name" : "De Koningshoeven"
}
{
"beer_name" : "Belgian Winter Beer",
"brewery_name" : "Huyghe"
}
|
→
|
{ $group: {
* _id: '$brewery_name',*
count: { *'$sum': 1* }
} }
↓
{
"_id" : "Huyghe",
"count" : 2
},
{
"_id" : "De Dolle Brouwers",
"count" : 1
},
{
"_id" : "De Koningshoeven",
"count" : 1
},
|