MongoDB aggregate function
Starting in MongoDB 4.4, the $function and $accumulator allows users to define custom aggregation expressions in JavaScript if the provided pipeline operators ... ,Returns the result of a user-defined accumulator function. $addToSet. Returns an array of unique expression values for each group.
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 MongoDB aggregate function 相關參考資料
$avg (aggregation) — MongoDB Manual
Grouping the documents by the item field, the following operation uses the $avg accumulator to compute the average amount and average quantity for each grouping ... https://docs.mongodb.com $function (aggregation) — MongoDB Manual
Starting in MongoDB 4.4, the $function and $accumulator allows users to define custom aggregation expressions in JavaScript if the provided pipeline operators ... https://docs.mongodb.com $group (aggregation) — MongoDB Manual
Returns the result of a user-defined accumulator function. $addToSet. Returns an array of unique expression values for each group. https://docs.mongodb.com $max (aggregation) — MongoDB Manual
Changed in version 5.0. ... Returns the maximum value. $max compares both value and type, using the specified BSON comparison order for values of different types. https://docs.mongodb.com $sum (aggregation) — MongoDB Manual
Grouping the documents by the day and the year of the date field, the following operation uses the $sum accumulator to compute the total amount and the count ... https://docs.mongodb.com aggregate — MongoDB Manual
Changed in version 3.6: MongoDB 3.6 removes the use of aggregate command without the cursor option unless the command includes the explain option. Unless you ... https://docs.mongodb.com Aggregation — MongoDB Manual
https://docs.mongodb.com db.collection.aggregate() — MongoDB Manual
Starting in MongoDB 4.2, if the client that issued the db.collection.aggregate() disconnects before the operation completes, MongoDB marks the db.collection. https://docs.mongodb.com How to Use Custom Aggregation Expressions in MongoDB 4.4
2020年7月28日 — This feature, called Custom Aggregation Expressions, allows you to write JavaScript functions that execute as part of an aggregation pipeline ... https://www.mongodb.com MongoDB - Aggregation - Tutorialspoint
MongoDB - Aggregation ... Aggregations operations process data records and return computed results. Aggregation operations group values from multiple documents ... https://www.tutorialspoint.com |