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bleft/monogdb.js

Created April 28, 2017 12:56
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mongo-helper
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monogdb.js
// find duplicates
db.collection.aggregate([
{ $group: {
_id: { firstField: "$firstField", secondField: "$secondField" },
uniqueIds: { $addToSet: "$_id" },
count: { $sum: 1 }
}},
{ $match: {
count: { $gt: 1 }
}}
])
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