Jaya Zenchenko sigma23
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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