Mongodb distinct not working Is the only option to iterate over all of the documents myself to do this, or is there a better solution? In an attempt to use the underlying node-mongodb-native as suggested by the answerer I attempted to do this: When specifying collation, the locale field is mandatory; all other collation fields are optional. Aug 10, 2014 · The query selection is selecting documents, not elements from the array: {'taxonomies. As it is apparently the latter you're looking for, the bad news is, we currently don't support any projections in derived queries. Feb 8, 2018 · MongoDB has a distinct command which returns an array of distinct values for a field; you can check the length of the array for a count. The following example retrieves the distinct values of the borough field in the restaurants collection:. For sharded collections, you cannot use the db. Returning unique mongodb documents using distinct not working. Aug 24, 2017 · I have a rather large database that I am trying to get a distinct list of a particular field from. distinct('user',function(err, results){ }); But this is not giving the distinct results. 1. If the value of the specified field is an array, distinct considers each element of the array as a separate value. 0. field_name should be the field for which you want to return distinct values. Returns distinct values of the title from the matched documents You can use the aggregation framework to group by the element you want to be distinct (group makes it distinct). In the sample documents supplied there is 2 documents with id:2 so creating a unique index would failed with E11000-duplicate-key-error. Jan 16, 2024 · While a unique index would work to ensure null are not in the distinct() result set, they would prevent adding documents with the same id. find({query}). db. find(query) then it returns all the recipientId's documents. For instance, if a field has as its value [ 1, [1], 1 ], then distinct considers 1, [1], and 1 as separate values. There is a shell db. It returns a document that contains an array of the distinct values, as well as an embedded document with query statistics and the query plan. runCommand({ distinct : "students", key : "subject", query : {"name":"Mark"} }) For distinct command you can refer the MongoDB documentation. Ask Question Asked 6 years, 4 months ago. The following example retrieves the distinct values of the borough field in the restaurants collection: Feb 3, 2024 · In this tutorial, we will explore the process and varied approaches to selecting distinct values from a collection in MongoDB. distinct("subject", { "name": "Mark" }) If you are trying to do the same in mongo-shell. Matches documents in which the directors contains "Natalie Portman". distinct('myfiel To retrieve the distinct values for a specified field, call the distinct () method and pass in the name of the field you want to find distinct values for. Currently MongoDB does not support to retrieve documents in a distinct way. Mar 24, 2015 · To find distinct players I have used the query as below: GamePlayer. Working with databases frequently involves handling large datasets with potential duplicates. find(). distinct('messageTrackingId') to Messages. Nov 20, 2018 · distinct query with lumen and mongodb not working. Let’s say we have a MongoDB collection named ‘products’ which contains multiple documents with potential duplicate items. Starting in MongoDB 6. getCollection('mycollection'). distinct("born_in_city"), but there doesn't seem to be anything equivalent for Mongoose. distinct('myfield') in ~0. but when I add distinct, I get no results. Nov 17, 2019 · if I changed Messages. Feb 22, 2015 · Distinct do not take arguments as it adds DISTINCT in your sql query, however, you MAY need to define the column name that you'd want to select distinct with. To find the distinct values for a sharded collection, use the aggregation pipeline with the $group stage instead. The following example retrieves the distinct values of the borough field in the restaurants collection: Nov 17, 2019 · if I changed Messages. createCollection()), the operation uses the collation specified for the collection. In MongoDB, the distinct aggregation command finds the distinct values for a specified field across a single collection. If the collation is unspecified but the collection has a default collation (see db. distinct("field_name", query) will return all the distinct values from your collection in the form of an array. Hot Network Questions Nov 17, 2019 · if I changed Messages. So if you wish to sort on score then get distinct keys you could do the following - sort by score, group by key and add score as arrays of elements (already sorted): Feb 3, 2024 · Introduction. Laravel Eloquent distinct not working as intended. 0, the distinct command returns the same results for collections and views when using arrays. For descriptions of the fields, see Collation Document. collection. name':'AM'} That criteria will select the entire document. 1 Sep 13, 2012 · In native MongoDb I could just do db. You can try this: db. person. As a result, all items in both arrays are considered as valid for the distinct operation. distinct() helper as well: Aug 24, 2017 · I have a rather large database that I am trying to get a distinct list of a particular field from. Thus, if you have Flight->select('project_id')->distinct()->get() is equialent to SELECT DISTINCT 'project_id' FROM flights and you may now add other modifiers like count() or even raw The following example performs the following on the movies collection:. How do I achieve distinct result in mongoose. Our target is to filter the duplicate entries and retrieve a list of unique products. Such is the case with MongoDB, a NoSQL database popular for its flexibility and scalability. . See Distinct Operation for details. Select Distinct in Node jS and MongoDB. It only supports returning distinct field values using the distinct command . Dec 21, 2017 · students. distinct() method or the distinct command. To do this in the console I execute: db. tvnc qheb bjagybhxq icg fqwkzv folkmi pewcsma xhamkvle svl zgjmik rzcvzc xwog ntcizt sdqu rnaxv