aggregation

来源： https://stackoverflow.com/questions/64158838/mongodb-aggregation-for-filtering-list-based-on-ids-present-in-object-of-array-f

来源： https://stackoverflow.com/questions/30323937/is-it-possible-to-sort-buckets-in-terms-aggregation-response-on-a-non-term-field

来源： https://stackoverflow.com/questions/30323937/is-it-possible-to-sort-buckets-in-terms-aggregation-response-on-a-non-term-field

来源： https://stackoverflow.com/questions/63802394/aggregation-or-dependency-in-the-simple-factory-uml

来源： https://stackoverflow.com/questions/26534330/error-multiple-columns-are-specified-in-an-aggregated-expression-containing-an

来源： https://stackoverflow.com/questions/26534330/error-multiple-columns-are-specified-in-an-aggregated-expression-containing-an

来源： https://stackoverflow.com/questions/26534330/error-multiple-columns-are-specified-in-an-aggregated-expression-containing-an

来源： https://stackoverflow.com/questions/26534330/error-multiple-columns-are-specified-in-an-aggregated-expression-containing-an

问题 I am VERY close to getting what I want out of this query... but I only want SOME of the fields returned and right now it is returning all of them NOTE : This is a refinement : I am now asking how to return only certain fields , while my similar question asks how to return the data between a start and end date In addition, can somebody please please provide an answer using the MongoDB Playground with MY data sets so I can try it out... I can't quite figure out how to "name" the data sets so

问题 I would like to get all Notifications between a start and end date that are related to a Register when I pass in a userId. Register Schema const mongoose = require('mongoose'); const Schema = mongoose.Schema; const RegisterSchema = new Schema({ userId: {type: Schema.Types.ObjectId, required: true}, accessToken: {type:String, required: true, default: null}, }) module.exports = Register = mongoose.model( 'register', RegisterSchema) Here is some register data [ { "_id": "5eac9e815fc57b07f5d0d29f