mongo group by
db.getCollection('full_score').aggregate([
{"$group" : {_id:"$target.name", count:{$sum:1}}}
])
db.getCollection('preselection_subject_analyze').find({project:"430000-6a6409b8abc243828ed0d584cb710fa4",
"range.name":"student",
"target.id":"001002003008",
}).sort({"originalScoreAnalyzeProvinceRank":1})