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nucknorris/gist:6352442

Forked from eranation/gist:3241616
Created August 27, 2013 11:34
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gistfile1.js
//equivalent of "select count (distinct fieldName) from someTable"
db.someCollection.aggregate([{ $group: { _id: "$fieldName"} },{ $group: { _id: 1, count: { $sum: 1 } } } ])
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