mongodb aggregate sort
db.users.aggregate( [ $sort : age : -1, posts: 1 } } ] ). This operation sorts the documents in the users collection, in descending order according by the age field and then in ascending order according to the value in the posts field. When comparing va,The documents are sorted by count in descending order. The $sortByCount stage has the following prototype form: copy. copied. $sortByCount: <expression> } ... ,When a $sort immediately precedes a $limit in the pipeline, the $sort operation only maintains the top n results as it progresses, where n is the specified limit, and MongoDB only needs to store n items in memory. This optimization still applies when allo, You almost had it... db.test.aggregate( $group: _id: '$postcode', students: $sum: 1}}}, $sort: _id: -1}} );. gives (I added some test data matching your sample): "result" : [ "_id" : 2003, "students" : 3 }, ", You can do this by $unwind ing the updates array, sorting the resulting docs by date , and then $group ing them back together on _id using the sorted order. db.servers.aggregate( $unwind: '$service.apps.updates'}, $sort: 'service.apps.updates, The mongodb aggregation API seems to have changed. Now you would do db.coll.aggregate([ $group: _id: "$a", countA: $sum: 1}, sumC: $sum: "$c"}, } }, $sort:a:1} } ]). Note the Array syntax for the argument to aggregate(). You'd,Your aggregate query is incorrect. You add the sort and limit to the match, but that's now how you do that. You use different pipeline operators: db.friends.aggregate( [ $match: advertiser: "noc3" } }, $sort: createdDate: -1 } }, $limit, The fields you're sorting on are part of the _id so you need to include that in your $sort field names: db.builds.aggregate([ $group: _id: month: $month: "$time" }, day: $dayOfYear: "$time" }, year: $year: "$time" , You need to create a pipeline that creates the extra refCount field to hold the total count. The first pipeline would be $addField as it allows you to add new fields to the document. The sum is made possible with the $add operator. The preceding pipeline
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 mongodb aggregate sort 相關參考資料
$sort (aggregation) — MongoDB Manual 3.6 - MongoDB Documentation
db.users.aggregate( [ $sort : age : -1, posts: 1 } } ] ). This operation sorts the documents in the users collection, in descending order according by the age field and then in ascending order accor... https://docs.mongodb.com $sortByCount (aggregation) — MongoDB Manual 3.6
The documents are sorted by count in descending order. The $sortByCount stage has the following prototype form: copy. copied. $sortByCount: <expression> } ... https://docs.mongodb.com $limit (aggregation) — MongoDB Manual 3.6 - MongoDB Documentation
When a $sort immediately precedes a $limit in the pipeline, the $sort operation only maintains the top n results as it progresses, where n is the specified limit, and MongoDB only needs to store n ite... https://docs.mongodb.com mongodb aggregation sort - Stack Overflow
You almost had it... db.test.aggregate( $group: _id: '$postcode', students: $sum: 1}}}, $sort: _id: -1}} );. gives (I added some test data matching your sample): "result" : [ &quo... https://stackoverflow.com aggregation framework - Mongodb sort inner array - Stack Overflow
You can do this by $unwind ing the updates array, sorting the resulting docs by date , and then $group ing them back together on _id using the sorted order. db.servers.aggregate( $unwind: '$servi... https://stackoverflow.com Mongodb group and sort - Stack Overflow
The mongodb aggregation API seems to have changed. Now you would do db.coll.aggregate([ $group: _id: "$a", countA: $sum: 1}, sumC: $sum: "$c"}, } }, $sort:a:1} } ]). Note the ... https://stackoverflow.com aggregation framework - sort by date with aggregate request in ...
Your aggregate query is incorrect. You add the sort and limit to the match, but that's now how you do that. You use different pipeline operators: db.friends.aggregate( [ $match: advertiser: &quo... https://stackoverflow.com sorting - MongoDB aggregation sort not working - Stack Overflow
The fields you're sorting on are part of the _id so you need to include that in your $sort field names: db.builds.aggregate([ $group: _id: month: $month: "$time" }, day: $dayOfYear... https://stackoverflow.com MongoDb aggregation query using $project and $sort - Stack Overflow
You need to create a pipeline that creates the extra refCount field to hold the total count. The first pipeline would be $addField as it allows you to add new fields to the document. The sum is made ... https://stackoverflow.com |