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kylemclaren/mongodb-find-duplicate-field-values.js

Created March 31, 2020 16:27
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mongodb find duplicate field values
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mongodb-find-duplicate-field-values.js
m = function () {
emit(this.my_field, 1);
}
r = function (k, vals) {
return Array.sum(vals);
}
res = db.MyCollection.mapReduce(m,r, { out : "my_output" });
db[res.result].find({value: {$gt: 1}});
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