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828 2023-04-03 03:45:06
//类似于$sum
的操作还有很多,比较常用的是$min
(求最小值),$max
(求最大值) 查询条件 match 和聚合 group 查询一定要注意顺序
aggregate := mongo.Pipeline{bson.D{{"$match" ,bson.D{{ "season_id", seasonId},{"data_source_at",bson.M{"$gte": start}},{"data_source_at",bson.M{"$lte": end}}},},},bson.D{{"$group", bson.D{{"_id", "$student_id"},{"win_count", bson.D{{"$sum", "$win_count"},}},{"school_id", bson.D{{"$first", "$school_id"},}},}},},}
//另外一种写法
aggregate := mongo.Pipeline{
{
{"$match" ,bson.D{
{ "season_id", seasonId},
{"data_source_at",bson.M{"$gte": start}},
{"data_source_at",bson.M{"$lte": end}},
},
},
},
{
{"$group", bson.D{
{"_id", "$student_id"},
{"win_count", bson.D{
{"$sum", "$win_count"},
}},
{"up_star", bson.D{
{"$sum", "$up_star"},
}},
}},
},
}