Create a gist now

Instantly share code, notes, and snippets.

Embed
MongoDB Aggregation Framework way for "select count (distinct fieldName) from someTable" for large collections
//equivalent of "select count (distinct fieldName) from someTable"
db.someCollection.aggregate([{ $group: { _id: "$fieldName"} },{ $group: { _id: 1, count: { $sum: 1 } } } ])
@clarkenheim

This comment has been minimized.

Show comment
Hide comment
@clarkenheim

clarkenheim Jul 6, 2015

Found this ^ when i wanted this: https://gist.github.com/clarkenheim/fa0f9e5400412b6a0f9d
returns a result with the distinct field names, and a count of the documents in the collection which have each distinct field value.

Found this ^ when i wanted this: https://gist.github.com/clarkenheim/fa0f9e5400412b6a0f9d
returns a result with the distinct field names, and a count of the documents in the collection which have each distinct field value.

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment