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 ... ,Starting in MongoDB 4.2, if the client that issued the db.collection.aggregate() disconnects before the operation completes, MongoDB marks the db.collection. ,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 ...,Returns the result of a user-defined accumulator function. $addToSet. Returns an array of unique expression values for each group. ,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.,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 ... ,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 ...,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 ... ,MongoDB - Aggregation ... Aggregations operations process data records and return computed results. Aggregation operations group values from multiple documents ...
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 MongoDB aggregate function 相關參考資料
Aggregation — MongoDB Manual
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 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 $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 $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 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 $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 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 |