Vadym vadymberkut
eranation
/ gist:3241616
Created
August 2, 2012 22:51
MongoDB Aggregation Framework way for "select count (distinct fieldName) from someTable" for large collections
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| //equivalent of "select count (distinct fieldName) from someTable" | |
| db.someCollection.aggregate([{ $group: { _id: "$fieldName"} },{ $group: { _id: 1, count: { $sum: 1 } } } ]) |
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| export enum MongoErrorCode { | |
| OK = 0, | |
| InternalError = 1, | |
| BadValue = 2, | |
| OBSOLETE_DuplicateKey = 3, | |
| NoSuchKey = 4, | |
| GraphContainsCycle = 5, | |
| HostUnreachable = 6,// Categories: NetworkError, RetriableError | |
| HostNotFound = 7,// Categories: NetworkError, RetriableError | |
| UnknownError = 8, |