Created
December 10, 2019 03:36
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| db.getCollection('summoners').aggregate([ | |
| { | |
| $group: { | |
| _id: { name: '$name' }, | |
| uniques: { $addToSet: "$_id" }, | |
| count: { $sum: 1 } | |
| } | |
| }, | |
| { | |
| $match: { | |
| count: { "$gt": 1 }, | |
| } | |
| } | |
| ]); |
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https://www.compose.com/articles/finding-duplicate-documents-in-mongodb/