mongodb count unique values aggregation
The _id field of each output document contains the unique group by value. ... For more information, see the db.collection.aggregate() method and the aggregate ... ,Count all the people with cats using the aggregate pipeline. ... to use $cond to do this: http://docs.mongodb.org/manual/reference/operator/aggregation/cond/.
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 mongodb count unique values aggregation 相關參考資料
$count (aggregation) — MongoDB Manual
$count: <string> }. <string> is the name of the output field which has the count as its value. <string> must be a non-empty string, must not start with $ and must not ... https://docs.mongodb.com $group (aggregation) — MongoDB Manual
The _id field of each output document contains the unique group by value. ... For more information, see the db.collection.aggregate() method and the aggregate ... https://docs.mongodb.com Counting distinct fields with $project and $match
Count all the people with cats using the aggregate pipeline. ... to use $cond to do this: http://docs.mongodb.org/manual/reference/operator/aggregation/cond/. http://www.forwardadvance.com Counting distinct values in MongoDB - Stack Overflow
The following query will output the distinct counts: db.collection.aggregate([ $unwind: "$services" }, $group : _id : "services-service-type": ... https://stackoverflow.com Distinct count of multiple fields using mongodb aggregation ...
... as you see fit to include or exclude the set of unique values or the size. ... Running the following aggregate pipeline should give you the ... https://stackoverflow.com MongoDB aggregate - distinct count specific element - Stack Overflow
1 Answer. For getting the unique customer count requires creating a set of the unique customer ids within the group pipeline using the $addToSet operator. Once you get the array, use the $size operat... https://stackoverflow.com mongodb aggregate distinct count - Stack Overflow
All you need to do is have the grouping twice. db.tankevent.aggregate([ $match: query }, $project : isoDay: $isoDayOfWeek: "$txnDate" } ... https://stackoverflow.com MongoDB Aggregation: Counting distinct fields - Stack Overflow
I figured this out by using the $addToSet and $unwind operators. Mongodb Aggregation count array/set size db.collection.aggregate([ $group: ... https://stackoverflow.com MongoDB count distinct value? - Stack Overflow
To get occurrences of distinct values of a field 'field1' on a collection ... get the counts of occurrences, this is better suited to the aggregation ... https://stackoverflow.com Select Group by count and distinct count in same mongodb query ...
Changing your SQL mindset, "distinct" is really just another way of ... have two group operations happening here and, in aggregation pipeline terms, ... is "group" up all of those... https://stackoverflow.com |