Created
May 5, 2015 18:23
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MongoDB Aggregation equivalent of SQL SELECT COUNT(DISTINCT FieldName) FROM ColletionName
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| db.CollectionNameHere.aggregate([ | |
| { $group: { _id: "$FieldNameHere"} }, | |
| { $group: { _id: 1, count: { $sum: 1 } } } | |
| ], { allowDiskUse: true }) |
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