group-by

What is the correct way to do a HAVING in a MongoDB GROUP BY?

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New answer using Mongo aggregation framework After this question was asked and answered, 10gen released Mongodb version 2.2 with an aggregation framework. The new best way to do this query is: db.col.aggregate( [ { $group: { _id: { userId: “$userId”, name: “$name” }, count: { $sum: 1 } } }, { $match: { count: { … Read more

ElasticSearch group by multiple fields

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Starting from version 1.0 of ElasticSearch, the new aggregations API allows grouping by multiple fields, using sub-aggregations. Suppose you want to group by fields field1, field2 and field3: { “aggs”: { “agg1”: { “terms”: { “field”: “field1” }, “aggs”: { “agg2”: { “terms”: { “field”: “field2” }, “aggs”: { “agg3”: { “terms”: { “field”: “field3” … Read more

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