MongoDB高级查询[聚合Group]
"results" : [{
"_id" : {
"key0" : "BT",
"key1" : "hardware",
"key2" : "CRUD"
},
"value" : 400
},
{
"_id" : {
"key0" : "BT",
"key1" : "services",
"key2" : "VOCI"
},
"value" : 200
},
{
"_id" : {
"key0" : "IT",
"key1" : "hardware",
"key2" : "HIM"
},
"value" : 200
},
{
"_id" : {
"key0" : "IT",
"key1" : "software",
"key2" : "Grad"
},
"value" : 200
}
],
"timeMillis" : 1,
"timing" : {
"mapTime" : NumberLong(1),
"emitLoop" : 1,
"total" : 1
},
"counts" : {
"input" : 5,
"emit" : 5,
"output" : 4
},"ok" : 1
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